Question

Zoe's video game controller needs a pack of batteries Zoe test two brands of batteries Brand X runs for 20 hours and brand y runs for 12 hours if zoey plays video games for a 120 hours this year how many fewer packs of Brand X what she need than brand y

Answer 1

Set up a systems of equations:
Let P stand for number of packs
Px=120/20
Py=120/12
Px=6
Py=10
10-6=4
She will need 4 fewer.