Question 940696
Jack=Jill-58 years
If the sum their ages totals 92 in seven years the sum is presently:
92-14 (7 years for each)=78 years
So Jill + Jack=78 years
Substitute for Jack, solve for Jill:
   Jill + Jill -58 years=78 years
      Jill+Jill=136 years Add 58 years to both sides
          2Jill=136
           Jill=68   Divide both sides by 2 ANSWER Jill's Age
This would make Jack 10
CHECK:
In 7 years, Jack will be 17 and Jill will be 75
Jack in 7 + Jill in 7=92 years
17 years + 75 years=92 years
           92 years=92 years