Question 696861
Al's current age A
Bill's current age B.

"10 years ago, Al was half as old as Bill is now"  A-10= B/2
 
"7 years from now, Al will be as old as Bill is now"  A+7=B

B/2=A-10 can be written as B= 2A-20 ( multiply by 2 on both sides) . From second equation B= A+7

2A-20= A+7

2A-A=20+7 

 SO

 A=27

 B= 27+7=34