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30.10.2020 •
Mathematics
Eric, Peyton and Nathan go to a Chinese restaurant from lunch and order three different platters. Eric orders 2 portions of fried rice and 1 portion of chow mien. Peyton ordered 1 portion of fried rice, 1 portion of chow mien and 1 portion of sauteed broccoli. Nathan ordered 1 potion of sauteed broccoli and 2 portions of chow mien. Eric paid $5, Peyton paid $5.25 and Nathan paid $5.75 for their meals. How much does each item cost? *
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Ответ:
Step-by-step explanation:
Step 1: Create expressions
Assume that fried rice is x
Assume that chow mein is y
Assume that sauteed broccoli is z
Expression for Eric's order would be;
x + y = 5
Expression for Peyton's order would be;
x + y + z = 5.25
Expression for Nathan's order would be;
2y + z = 5.75
Step 2: Express in like terms
Now express z and x in terms of y so that we can solve for y;
2y + z = 5.75 x + y = 5
z = 5.75 - 2y x = 5 - y
Step 3: Solve variables
Solve for y
x + y + z = 5.25
(5 - y) + y + (5.75 -2y) = 5.25
5 + 5.75 - 2y = 5.25
10.75 - 2y = 5.25
2y = 10.75 - 5.25
2y = 5.5
y = $2.75
Solve for x;
x = 5 - y
= 5 - 2.75
= $2.25
Solve for z;
= 5.75 - 2y
= 5.75 - 2 * 2.25
= $0.25
Fried rice is $2.25
Chow mien is $2.75
Sauteed broccoli is $0.25
Ответ:
the first for the first one and the second for the second