Jackson's age was 2/fifth of the age he will be 20 years from now seven years ago. How old is Jackson now?

25

he's be 25 ...

:l

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Let's say Jackson's age now is x.

In 20 years, (so 20+x), Jackson seven years ago will be 2/5ths of that age.

So 2/5 (20+x) = x-7

Then you solve the equation

8+2/5x=x-7

15=3/5x

x=25

Jackson is 25 years old.

Let's check our answer! In 20 years, Jackson will be 45. 7 years ago, he was 18. 2/5 of 45 is 18. Our answer is correct!