Question

Jackie and a classmate spent a total of 20 hrs working on a chemistry project. Jackie’s classmate spent 2 hrs less time working on the project than Jackie. How long did Jackie work on the project?

Answer 1

x = 11

Explanation:

x + (x - 2) = 20

2x - 2 = 20

2x - 2 + 2 = 22 + 2

2x = 22

x = 11