You receive 9 text messages in 12 minutes. What is the rate of text messages per hour?

Remember 60 mins per hour

9 per 12

use ratio and proportion

9:12=x:60

9/12=x/60

multiply both sides by 60

540/12=x

45=x

the answer is 45

a shortcut is yo know that 12 times 5=60 so

9 times 5=answer since 12 times 5=60

answer isi 45