An alloy weighing 30 lbs. is 11% tin. The alloy was made by mixing a 15% tin alloy and a 9% tin alloy. How many pounds of each a
lloy were used to make the 11% alloy?
1 answer:
Answer:
20 lbs of 9%
10 lbs of 15%
Step-by-step explanation:
x: 9%
y: 15%
x + y = 30
y = 30 - x
0.09x + 0.15y = 0.11(30)
0.09x + 0.15(30 - x) = 3.3
-0.06x = -1.2
x = 20
y = 10
y = 30 - x
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