Question

A boy is twice as old as his sister, and half as old as his father.In 50 years,his sister will be half as old as his father.what is the boy's present age?​

Answer 1

Answer:

Let y be the age of his sister now,

(2×2)y+50=2(y+50)

4y+50=2y+2×50

4y-2y=100–50

2y=50

y=50/2

y=25

His sister is 25 now, therefore the boy is 25×2=50 now.