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3 years ago

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Ann purchased a prepaid phone card for 20$. Long-distance calls cost 12 cents a minute using this card. Ann used her card only o

nce to make a long-distance call. If the remaining credit on her card is 16.76$, how many minutes did her call last?

1 answer:

Lorico [155]3 years ago

5 0

27 minutes
subtract 16.76 from 20, your answer divide by .12

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Alekssandra [29.7K]

Answer: a) $25x+30y=221.25\\5x+45y=191.25$

b) Cost of a macadamia nut chip cookie is $33.93 and the cost of triple chocolate cookie. is $3.77

c) Elimination method because it enables us to eliminate one of the variables.

Step-by-step explanation:

Let x be the cost of macadamia nut chip cookie and y be the cost of triple chocolate cookie.

Then according to the question we have the following equations:-

$25x+30y=221.25..................(1)\\5x+45y=191.25.......................(2)$

Multiplying 5 on both sides of the equation (2), we get

$25x+225y=956.25$ ...............(3)

By using elimination method, subtract equation (1) from (3) we get

$195y=735\\\Rightarrow\ y=3.77$

Substitute the value of y in (2), we get

$5x+45(3.77)=191.25\\\Rightarrow\ 5x=191.25-169.65\\\Rightarrow\ x=33.93$

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