Asked by Kate

Mary is 15 years older than her niece Katie. In 10 years Mary is two times as old as Katie. How old are Mary and Katie now?

How do I solve this (equation + work)
Thank you!

Answers

Answered by Reiny
Katie's age -- x
Mary's age -- x+15

10 years from now:
Katie : x+10
Mary : x+15 + 10 = x + 25

"Mary is two times as old as Katie" ---> 2x+25 = 2(x+10)

should be easy to solve
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