Jill has 1 1/2 kilograms of frosting. If she’s uses 50 grams of frosting on each cupcake, how many cupcakes can she frost
There are 1000 grams in a kilogram; so in 1 1/2 kilograms of frosting, she has 1500 grams of frosting.
Since she uses 50 grams of frosting on each cupcake, she can frost 1500 / 50 = answer cupcakes.