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tatuchka [14]
3 years ago
10

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

Mathematics
2 answers:
vovikov84 [41]3 years ago
7 0

0.17/30 = x/450 <em>Use proportion</em>

76.50 = 30x <em>Cross multiply</em>

2.55 = x <em>Divide 30 both sides</em>

<em />

7.5 minutes call would cost 2.55

Yanka [14]3 years ago
5 0

Answer:

255 ¢ or 2.55$

Step-by-step 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 ¢

<h3><u><em>Hope it helps</em></u></h3>

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