Cagney can frost a cupcake every 20 seconds and Lacey can frost a cupcake every 30 seconds. Working together, how many cupcakes can they frost in 5 minutes?

Question

The answer options are: A) 10    B) 15   C)20    D) 25    E)30

Answer 1

25 cupcakes.  Cagney can frost 3 cupcakes a minute. (20 seconds x3=60 seconds or 1 minute) 3x 5(time allowed) = 15

 

                     Lacey can frost 2 cupcakes a minute. (30seconds x 2 = 60 seconds or 1 minute)  2x5(time allowed) =10

                     15+10=25 cupcakes in 5 minutes.