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11 students bought either cookies for 40 cents or brownies for 50 cents each Total amount spent was 5.10 how may cookies and brownies did they buy?
Wiki User
∙ 14y ago
Let the cookies be x and the brownies be y
x + y = 11, so x = 11 - y
40x + 50y = 510
substituting 11 - y for x, 40(11 - y) + 50y = 510,
simplifying, 440 - 40y + 50y = 510
then 10y = 70 and y = 7
substituting y = 7 in x = 11 - y, x = 11 - 7
simplifying, x = 4
Answer: 4 students bought cookies and 7 students bought brownies.
Wiki User
∙ 14y ago
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