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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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## Simplify

Simplify: 4(x-3)-x(a-2)-3
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## Find highest share?

If 500 is shared in the ratio 2：3：5, what will be the highest share?

## Speed of the boat in stream

Upstream boat speed=18km/hr and this speed is 500% more than stream speed. What is the downstream speed of the boat? Source
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## 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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## Maximum value of 2x+3y

If (x,y) lies on a circle of a radius 5 with the origin as its center, find the maximum value of (2x + 3y)
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## Probability of a fisherman

Every day a fisherman can choose to fish at sea, by a river, or at a lake. The probability that he fishes at sea, by the river, and at...
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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...

## Calculate the amount paid in each installments

An Electrical shop sells a video recorder for \$3200 cash price. The purchase deal is offered to a customer at an extra 20% cost. The customer pays a deposit...

## Simultaneous eqn – ii

3x + 4y -2z = 5 x – 3y – 3z = 4 2x – y – 4z = -8 Find x, y and z
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## Change in Temperature wrt time

A roasted turkey is taken from an oven when its temperature has reached 185°F and is placed on a table in a room where the temperature is 75°F. (a)....
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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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## Base conversion

If (11011)2 = (____________)10, then the number in the blank space is: a. 33 b. 22 c. 27 d. 30
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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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## 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?
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## solve for x

(x+10)(x-3) = (-x-10)(6x+7)
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## write equation for polynomial

Write an equation for a polynomial that has the solution set {-1 , 3, 4}
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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
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