Question

Lisa is 16 years younger than Kathy. If the sum of their ages is 30, how old is Lisa?​

Answer 1

Lisa would be 7.

Explanation:

Substitute both Lisa and Kathy's ages for X values.

x + x - 16 = 30

Then add up the x's.

2x - 16 = 30

Add 16 to both sides.

2x = 14

Divide by 2 on both sides, and solve.

x = 7

Check your work by adding.

7 + 16 = 23

23 + 7 = 30