Question 634559
Let x=Jill's age now; x+10=Jill's age 10 years from now
Then x+14=Jack's age now; x+24=Jack's age 10 years from now
Now we are told that:
x+24=2(x+10) simplify
x+24=2x+20 subtract x and also 20 from each side
x=4---Jill's age now
x+14=18 Jack's age now
Then in 5 years Jack will be 18+5=23 years old

Hope this helps----ptaylor