Paul uses 1 can of frosting to frost a layer cake.  He uses a half can of frosting for a single cake, or a single pan of brownies, or a dozen cupcakes.  For Saturday, he needs to have 3 layer cakes, 6 dozen cupcakes, 12 single cakes and 18 pans of brownies ready and frosted for customer pick up.  How many cans of frosting will he need?
How many cans of frosting does Paul need? ** He needs 1 can of frosting per layer cake and he needs to make 3 layer cakes so that's 1*3 = <<1*3=3>>3 cans of frosting
How many orders does Paul need to make? ** There are 6 dozen cupcakes,12 single cakes and 18 pans of brownies for a total of 6+12+18 = <<6+12+18=36>>36 orders
How many cans of frosting does Paul need? ** Each of the 36 orders needs 1/2 can of frosting so they need 36*.5 = <<36*.5=18>>18 cans of frosting
How many cans of frosting does Paul need? ** He needs 3 cans of frosting for the layer cakes and 18 cans for the remaining items for a total of 3+18 = <<3+18=21>>21 cans of frosting
#### 21