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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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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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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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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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Logic

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

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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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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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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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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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

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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