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Subject :IMO    Class : Class 5

A combination lock requires 3 numbers to unlock. The second number is 3/5 of the first number. The third number is 3/4 of the second number. The difference between the first number and the third number is 33. What is the second number?

(A) 60

(B) 36

(C) 27

(D) 14
what is the best way to solve above?

Ans 1: (Master Answer)

Class : Class 1
Consider the first number as x. The second number will be 3x/5. The third number will be (3/4)(3x/5). Now, the difference between first and third number is 33. Put the values into the equation and get the answer. The correct answer is B.

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