Question

Kevin is 20 years older than his sister Joan.In 14 years,he will be twice as old as Joan.How old is of of them now?
Add 14 to their ages, and if Joan is x years old now, you have

x+20 + 14 = 2(x+14)
| Now |+ 14 years
------|------|------------------------
Kevin | x+20 |x+20+14;2(x+14
------|------|------------------------
Joan | x |x+14
------|------|------------------------

x+20+14= 2(x+14)
x+34= 2x+28
34-28=2x-x
x=6
x+20= 6+20= 26

So, Kevin is 26 while Joan is 6.

But, check my work.
So Substitute.
6+20+14 = 2(6+14)
40=12+28
40=40
I am right yay!!!!!

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