MATHEMATICS HIGH SCHOOL

A group of 18 people ordered soup and sandwiches for lunch. Each person in the group had either one soup or one sandwich. The sandwiches cost $7.75 eachand the soups cost $4.50 each. If the total cost of all 18 lunches was $113.50, how many sandwiches were ordered?

A. 7

B. 8

C. 9

D. 10

Answers

Answer 1
Answer: x - the number of sandwiches ordered
y - the number of soups ordered

There were 18 people, and each person ordered either one soup or one sandwich.
x+y=18

The sandwiches cost $7.75 each, the soups cost $4.50 each. The total cost was $113.50.
7.75x+4.5y=113.5

Set up a system of equations:
x+y=18 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |* (-4.5) \n7.75x+4.5y=113.5 \n \n-4.5x-4.5y=-81 \n\underline{7.75x+4.5y=113.5} \n3.25x=32.5 \nx=(32.5)/(3.25) \nx=10

10 sandwiches were ordered.
The answer is D.

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Answers

The answer is C) 4.24

4% + 7% = 11%

to get 11% of 38.50 you move the decimal two spaces to the left on the percent and multiply that number by the other number.

11% ---> .11

38.50 x .11= 4.24.

I hope this answer gave you a better understanding on how to work with percentages! :) Have a good day :)

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Answers

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Answers

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Answers

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Answers

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Answers

Answer:

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Step-by-step explanation:

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