Question

A machine can sew on 15 buttons in 3 min. How many buttons can it sew in 60 min?

Answer 1

In 60 minutes, the machine can sew 300 buttons. The machine sews 5 buttons a minute. 60 x 5 = 300

Answer 2

15/3 = x/60
60*15=900
900/3=300
answer is 300 buttons in 60 min