Question

Ratio of vroom's age to vicky's age is 10:9. If vroom will be 21 years, after 6 years what is the present age of vicky?

Answer 1

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Answer 2

Vroom : Vicky = 10 : 9

Define x:

Let x be the constant ratio

Vroom : Vicky = 10x : 9x

Express their age in 6 years:

Vroom = 10x + 6

Vicky = 9x + 6

Solve x:

Vroom will be 21 years old

10x + 6 = 21

10x = 15

x = 15 ÷ 10

x = 1.5

Find Vicky's age:

Vicky = 9x = 9(1.5) = 13.5 years old

Answer: Vicky is 13.5 years old