Question

A barber gives 16 haircuts in 5 hours. In minutes, at what rate is the barber giving one haircut? How many haircuts can he give in 8 hours?

A) 12 minutes; 40 haircuts
B) 15 minutes; 32 haircuts
C) 18.75 minutes; 25 haircuts
D) 21 minutes; 22 haircuts

Answer 1

18.75 minutes; 25 haircuts

Find the unit rate per minute:

5 hours = 300 minutes

300 minutes

16 haircuts

=

18.75 minutes

1 haircut

8 hours = 480 minutes

480 minutes

18.75 minutes per haircut

25.6 haircuts

Round DOWN to 25 haircuts.

Answer 2

C) 18.75 minutes; 25 haircuts

Explanation:

5 hours = 5 * 60 minutes = 300 minutes

5 hours for 16 haircuts =

= 300 minutes: 16 haircuts

= 300/16 minutes : 16/16 haircuts

= 18.75 minutes : 1 haircut

8 hours = 8 * 60 minutes = 480 minutes

480/18.75 = 25.6

18.75 * 25.6 minutes : 1 * 25.6 haircuts

480 minutes : 25.6 haircuts

Since 0.6 haircut is not a full haircut, he can give 25 haircuts in 480 minutes.