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## 4-digit number

How many 4-digit numbers are there with no digit repeated?

## Triangular matrix

If U1, U2 are upper triangular and L1, L2 are lower triangular, which of...

## The sunrise problem

Two women start walking at the sunrise, one from point A to B and...

## Calculate A+B+C+D

Find (A + B + C + D) such that AB x CB =...

## Puzzle

Can you solve in 1 minute?? Can you solve in 50 seconds? can you...

## Simplify

Simplify: 4(x-3)-x(a-2)-3

## Speed of the boat in stream

Upstream boat speed=18km/hr and this speed is 500% more than stream speed. What is...

## Faster runner, slower runner

Two runners start on a straight one-mile race track. The slower runner S is...

## Distance Between Two Places & Time Taken !

Manish and Rajni start from a place M at the same time to reach another...

## Maximum value of 2x+3y

If (x,y) lies on a circle of a radius 5 with the origin as...

## Probability of a fisherman

Every day a fisherman can choose to fish at sea, by a river, or...

## Simultaneous eqn – ii

3x + 4y -2z = 5 x – 3y – 3z = 4 2x...

## Math Logic

If, 3 = 6 4 = 12 5 = 20 6 = x What...

## Change in Temperature wrt time

A roasted turkey is taken from an oven when its temperature has reached 185°F...

## Distance Time

A cargo plane flew from the Clark across the Pacific at 255 kph and...

## One dimensional collision

A 1200kg car traveling initially at 25m/s in an eastern direction crashed into the...

## Largest possible sum

In the year 2001, the International Mathematics Olympiad was held in the USA. Let...

## Base conversion

If (11011)2 = (____________)10, then the number in the blank space is: a. 33...

## Sum of numbers on the faces of a cube

Positive integers are written on all the faces of a cube, one on each....

## Percentage change in salary

A man’s salary was first increased by 10% and then decreased by 10%. What...

## Age problem-2

One number is 3 times another number. If the larger number is diminished by...

## solve for x

(x+10)(x-3) = (-x-10)(6x+7)

## write equation for polynomial

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