Question

The ratio of A and B after 10 years is 4;5.The sum of their present ages is 70. what is the age of A.
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Answer 1

Answer:

The age of A is 30.

Step-by-step explanation:

Let the ages of A and B after 10 years be

4x and 5x respectively.

Given that sum of their present age is 70.

(Note that sum of present age means that 10 years have not passed.)

Hence present age of A=4x-10

and that of B=5x-10.

Given:-

4x-10 + 5x-10=70.

Solving,

9x-20=70

=> 9x=90

=> x=10.

Present age of A=4x-10=4×10-10=30.