Michelle earned $150 during the summer for babysitting. She bought 2 packs of Blu-ray disks worth $65 each using her babysitting money. How much money was left after she bought the Blu-ray disks?

What we know: Total money available = $150, each Blu-ray disk is $65, two packs were purchased.

$65 + $65 = $130

(disk one) (disk two) (total to buy both disks)

$150 - $130 = $20 (total money available) (cost of disks)

Therefore, there were $20 left over after she bought the Blu-ray disks.

65 • 2 = 130

150-130=20

Michelle has $20 left