Question

At work, Mr. Grinnell receives 20 phone calls every 60 minutes. How many calls should he expect to receive in 180 minutes?

60
80
100
40

Answer 1

60

Explanation:

Find out how many phone calls Mr. Grinnell receives in 1 minute.

60 mins = 20

1 min = 20 ÷ 60 = 0.333

180 mins = 0.333 x 180 = 59.94

59.94 rounded to the nearest whole number = 60

Answer 2

Use a ratio.

20/60 = x/180

180/60 = 3, so 20*3 is 60.

The answer is 60.