Question

Age of Rohan is half the age of Sohan and product of their ages is 128, then age of Rohan is:

 

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Answer 1

ANSWER:

Age of Rohan(x) = 8

ASSUMPTION:

Rohan's age = x

Sogan's age = y

GIVEN:

x = y/2

xy = 128

TO FIND:

Age of Rohan(x)

EXPLANATION:

2x = y

Substitute 2x = y in xy = 128

2x² = 128

x² = 64

x = √64

x = 8

VERIFICATION:

SOGAN'S AGE = 2(8) = 16

16 × 8 = 128

NOTE :

HERE √64 SHOULD NOT BE TAKEN AS ±6 BECAUSE AGE CANNOT BE NEGATIVE