Question

The ratio of Chris and Dom's ages is

3:4
In 7 years time this ratio will be 4:5
How old is Dom?
(INCORRECT ANSWERS WILL BE REPORTED)

Answer 1

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➷ 3x + 7 / 4x + 7 = 4/5

Cross multiply:

5(3x + 7) = 4(4x + 7)

Expand:

15x + 35 = 16x + 28

Subtract 28 from both sides:

15x + 7 = 16x

Subtract 15x from both sides:

x = 7

4(7) = 28

Dom is 28 years old

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