Question

Calculate the number of minutes that Jenn called within Canada, to the United

States, and to Mexico during the month of January. The charges are 10¢/min within
Canada, 20¢/min to the U.S., and 30¢/min to Mexico if the following conditions
applied:
. His total bill for the month was $12.5.
• He talked to U.S.was twice as talked to Mexico.
. The total number of minutes spent talking within Canada and to Mexico was
35.​

Answer 1

Canada = 20 minutes

United States = 30 minutes

Mexico = 15 minutes

Explanation:

lets use c for Canada, u for United States, and m for Mexico in the following equations to match each condition.

.10c + .20u + .30m = 12.50 -> move all the decimals to the right twice for 10c + 20u + 30m = 1250 (it will still have the same results)

2m = u (talked to U.S twice as he talked to Mexico.)

m + c = 35 (total minutes talking for Mexico and Canada)

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.10(20) + .20(30) + .30(15) = 12.50

2(15) = (30)

(15) + (20) = 35