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## Triangular matrix

If U1, U2 are upper triangular and L1, L2 are lower triangular, which of the following are triangular?  U1 + U2  U1U2  U12  U1 + L1  U1L1  L1 +...
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## The sunrise problem

Two women start walking at the sunrise, one from point A to B and another from point B to A. The pass each other exactly at noon. The first...
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## Calculate A+B+C+D

Find (A + B + C + D) such that AB x CB = DDD, where AB and CB are 2-digit numbers and DDD is a 3-digit number. ...
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## Puzzle

Can you solve in 1 minute?? Can you solve in 50 seconds? can you solve in 30 seconds? can you solve in 10 seconds? Mention the time that you...
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## Number Puzzle

Solve the puzzle with explaination Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)

## Faster runner, slower runner

Two runners start on a straight one-mile race track. The slower runner S is given a handicap and starts first. The faster runner F then starts and after 4...
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## How many coins can cover the entire table?

A rectangular table has 100 coins placed on it (centers must be on the table) such that none of the coins overlap, and it is impossible to place any...

## Distance Time

A cargo plane flew from the Clark across the Pacific at 255 kph and flew back to the Clark at 275 kph. Given that the first trip took 2...
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## One dimensional collision

A 1200kg car traveling initially at 25m/s in an eastern direction crashed into the back of a 9000kg truck moving at the same direction at 20m/s. The velocity of...
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## Largest possible sum

In the year 2001, the International Mathematics Olympiad was held in the USA. Let be distinct positive integers such that the product I * M * O =...
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## Sum of numbers on the faces of a cube

Positive integers are written on all the faces of a cube, one on each. At each corner (vertex) of the cube, the product of the numbers on the faces...
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## math crossword

Solve the maths crossword Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## Percentage change in salary

A man’s salary was first increased by 10% and then decreased by 10%. What is the total percentage change in his salary? Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## Age problem-2

One number is 3 times another number. If the larger number is diminished by 8, the resultant is 7 more than twice the smaller number. Find the numbers. ...
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## Laplace Transform MCQ

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## write equation for polynomial

Write an equation for a polynomial that has the solution set {-1 , 3, 4} Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## Speed, distance and time

A bicycle wheel has a diameter of 63cm. Calculate how many times the wheel turns round in traveling km. Use the value 22/7, for π Rate the...
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## Arithmetic Progression

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## Find the Last digit

What is the last digit of  Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## Logic

Move one matchstick to correct the equation Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## Age problem

If x/2 years ago John was 12 years old, and x/2 years from now he will be 2x years old, what will be his age 3x years from now?...
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## Find angle BAC

TA and TB are tangents to the circle. If ABC=48°, ATB= 72°,calculate angle BAC. Rate the problemHard (1)Spam (0)Helpful (0)Wow (0)
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## Money double problem

A sum of money triples itself in 20 years. When will it double? Options are: a) 5 years b) 15 years c) 10 years d) 8 years Rate the...
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## Logarithm

Prove that: log base 16 (XY) = 1/2 log base 4 (X) + 1/2 log base 4 (Y) Include the logarithmic rules used to prove the statement. Rate...
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## Solve for X

Solve for the value of X Rate the problemSpam (1)Hard (0)Helpful (0)Wow (0)
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## Arithmetic Progression: Find x and y

If 3, x, y and18 are arithmetic progression (), find x and y. Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## Probability- Even numbers greater than 5000

How many even numbers greater than 5000 can be formed using the digits 1,2,4,5,6. No digits used more than once. Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## Word problem

A garrison of 120 men is provisioned for 24 weeks at 350 gm per day per man. How many men must leave so that the same provision may last...
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## Find the average speed

For the first 100 miles of his trip, Sohan drove at 50 miles/hr. Then because of delays, he drove only 39 miles/hr for next 120 miles. What was his...
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## Aptitute test

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## Logic Time

There was war in a certain village and a man, his wife and two sons were trying to cross to the other side of the river so that they...
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## Exponential

Question source : Facebook que source ( × 10 to power 3)÷(7×10 to the power of-3) -5×10 to the power of-4 + × 10to power of-3 Evaluate the answer...
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## Find the Surface area and volume of the box

Problem source: Source A box has length 15cm,breadth 7cm and height 8cm. Find: (a)its total surface area? (b)its volume? Rate the problemHelpful (1)Spam (0)Hard (0)Wow (0)
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## SCIENCE

Which one of the metal is liquid at normal temperature- a) zinc b) mercury c) sodium d) water Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## SCIENCE

Protective sols are – a) lyophilic b) lyophobic c) both a and b d ) none Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)

## SCIENCE

The least distance of distinct vision for a young adult with normal vision is about a) 25 m b) cm  c) 25 cm d) m Rate...
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## science

The far point of a myopic person is 80 cm in front of the eye . What is the nature and power of the lens required to correct the...
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## science

The change in focal length of an eye lens is caused by the action of  A) Retina B) Iris C) Pupil D) Ciliary muscles Rate the problemSpam (0)Hard (0)Helpful (0)Wow (0)
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## science

The human eye forms the image of an object at its a) C0rnea                   b) iris          ...
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## Inverse

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