Answer:
32.5 minutes
Explanation:
If it's Lauren and 4 other people, then there are a total of 5 people
20/5 = 4
each person is going to frost 4 batches of cupcakes
if it takes 6 1/2 minutes to frost 1 batch and they all frost at the same rate then we need to multiply 6 1/2 by 5.
6 1/2 * 5 = 32.5
It's going to take her and her friends 32.5 minutes to frost the cupcakes