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Mathematics 18 Online
OpenStudy (anonymous):

An alloy of tin is 15% tin and weighs 20 pounds. A second alloy is 10% tin. How many pounds of the second alloy must be added to the first to get a 12% mixture? 30 lb 40 lb 60 lb

OpenStudy (anonymous):

i got b but i think its wrong

OpenStudy (anonymous):

Ignore the 1. haha. .20 * 15% + x * 10% = 12% * (20 + x) 3 + 0.1x = 2.4 + .12x 0.6 = 0.02x x=30

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