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sandy6265
25.08.2019 •
Mathematics
John sells hamburgers for $3 each and cheeseburgers for $3.50 each. one afternoon, he sells a total of 24 burgers for $79. how many hamburgers did he sell?
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Ответ:
x + y = 24
3x + 3.5 y = 79
x = 24 - y.
Substituting the value of x,
3( 24 - y) + 3.5 y = 79
72- 3y + 3.5 y = 79
72 + 0.5 y = 79
0.5y = 79 - 72 = 7
1/2 y = 7
thus, y = 7 * 2 = 14
Substituting the value for x,
x + y = 24
x + 14 = 24
x = 24-14 = 10
Thus, x = 10.
Thus, she sold 10 hamburgers and 14 cheeseburgers
Ответ:
answer:
add 7 then divide by 4
step-by-step explanation:
4a-7=5
+7 +7
4a=12
/3 /3
a=4
mark brainliest!