Jacob is 12 years old. He is 3 times as old as his brother. How old will Jacob be when he is twice as old?

Question

A girl is twice as old as her brother and half as old as her father. In 22 years, her brother will be half as old as his father. How old is all three now?

Answer 1

if jacob's age is 12,
12 = 3B
4 = B, so the brother is 4

how old will jacob be when he is twice as old as his brother?
Let that be x years from now. So in x years from now,

Jacob will be 12+x and his brother will be 4+x

12+x = 2(4+x)

12+x = 8+2x

4 = x

So that will be 4 years from now

So Jacob will be 12+4 or 16 and his brother will be 4+4 or 8.

Answer: Jacob will be 16.

Answer 2

jacob 12
his bro-4
now 12+x=(4+x)*2
so x=4
so jacob age 16