Question

Riya's age is 20 years after my age will be 3 times my present age. What will be Riya's age?

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Answer 1

$Present age =10yrs =x \\ 20 \: years \: after \: = 10 + 20 = 30 \\ 3 \: times \: present \: age = 3 \times 10 = 30 \\ 3 = x \\ 3 \times x \\ 3x = x + 20 \\ x = 20/ 2 = 10$

So Anu's age = 10