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Tags: <em>set theory divibilility divisible integers union intersection</em>
(3-2)-1=0
3-(2-1)=2
Boom! Done
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!
1.They basically all did one big bug,not separate hugs with different bears.