Question

Leo practices piano for a

minimum of 90 minutes each
week. On Monday, he
practiced 10 minutes. For the
rest of the week, he practiced
in 20-minute sessions. How
many sessions would it take to
meet his goal?

Answer 1

1 10 min session + x 20 min sessions = 90 min

10+20x=90

20x=80

x=4 sessions

Answer 2

4 sessions.

Explanation:

He starts with 10 minutes practiced and has to finish his quota in 20 minute sessions, so we can represent that with the equation 90=20x+10. Then solve for x.

90=20x+10

Subtract 10

80=20x

Divide by 20

x=4

It would take 4 sessions.