Michael has 4 packs of crayons and wants to buy 2 more. One pack of crayons costs $2.5. How much are all the packs of crayons Michael will have after the purchase worth?
After buying 2 more packs, Michael is going to have 4 packs + 2 packs = <<4+2=6>>6 packs of crayons.
In total all packs are going to be worth 6 packs * $2.5/pack = $<<6*2.5=15>>15.
#### 15