Question

The first machine makes a part every 8 seconds,the second machine makes a part every 15 seconds,and the third machine makes a part every 32 seconds.Ronna tests these three parts each time they all come out of the machine at the same time.How often does Ronna test the parts?Express your answer in minutes

Answer 1

You need to find a number that can be divided by 8,15 and 32.
Since 32 can be divided by 8, you don't need to count 8.
15*32=480 sec=8 min