SOLUTION: Kathy is 12 years younger than Jed. If the sum of their ages is 42, how old is Kathy?

Question 710709: Kathy is 12 years younger than Jed. If the sum of their ages is 42, how old is Kathy?
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

let Kathy's age be and Jed's age
if Kathy is years younger than Jed, then we have
.....eq. 1

if the sum of their ages is , then we have

.....eq. 2.......substitute from eq. 1

.......solve for

go back to .....eq. 1, substitute and solve for

....so, Kathy is years old

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