Question

Mobile phone calls are charged at 17 cents per 30 seconds.

If a call went for 7.5 minutes, How much would the call cost?

Answer 1

0.17/30 = x/450 Use proportion

76.50 = 30x Cross multiply

2.55 = x Divide 30 both sides

7.5 minutes call would cost 2.55

Answer 2

255 ¢ or 2.55$

Explanation:

i counted like this

l 30 seconds = 1

l 1 minute = 2

l 1.5 minutes = 3

l 2 minutes = 4

l 2.5 minutes = 5

l 3 minutes = 6

l 3.5 minutes = 7

l 4 minutes = 8

l 4.5 minutes = 9

l 5 minutes = 10

l 5.5 minutes = 11

l 6 minutes = 12

l 6.5 minutes = 13

l 7 minutes = 14

l 7.5 minutes = 15

So then 17 ¢ x 15 = 255 ¢

Hope it helps