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Fangflora3
23.01.2020 •
Mathematics
In the cafeteria all sandwich are priced the same in all drinks are priced the same a customer ordered three sandwiches and two drinks for $14.70 another customer bought two sandwiches and four drinks for $13.80 find the cost of one sandwich and the cost of one drink
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Ответ:
Cost of 1 sandwich = $3.9
Cost of 1 drink = $1.5
Step-by-step explanation:
Let us assume the cost of 1 sandwich = $ m
And the cost of 1 drink = $ n
Now, according to the question:
Cost of 3 sandwich + 2 drink = $14.7
⇒ 3 m + 2 n = $14.7 (1)
Cost of 2 sandwich + 4 drink = $13.8
⇒ 2 m + 4 n = $ 13.8 (2)
Solving both equation, we get:
Multiply (1) with -2 and add both equations, we get:
- 6 m - 4 n + 2 m + 4 n = 13 .8 -29.4
or, -4 m = -15.6
or, m = 3.9
Put m = 3.9 in 3 m + 2 n = $14.7, we get:
11.7 + 2 n = 14.7
2 n = 3 , or n = 1.5
Hence, cost of 1 sandwich = $3.9
and the cost of 1 drink = $1.5
Ответ:
the apple watch costs $460
Step-by-step explanation: