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goblinko [34]
4 years ago
10

Convert 5 feet to inches. There are 12 inches in 1 foot. A) 15 inches B) 20 inches C) 50 inches Eliminate D) 60 inches

Mathematics
1 answer:
Sedaia [141]4 years ago
6 0

5ft x 12in = 60 inches

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Answer: 490 grams of the first alloy should be used.

30 grams of the second alloy should be used.

Step-by-step explanation:

Let x represent the weight of the first alloy in grams that should be used.

Let y represent the weight of the second alloy in grams that should be used.

A chemist has two alloys, one of which is 15% gold and 20% lead. This means that the amount of gold and lead in the first alloy is

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If the alloy to be made contains 82.5 g of gold, it means that

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Multiplying equation 1 by 0.2 and equation 2 by 0.15, it becomes

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Substituting y = 30 into equation 1, it becomes

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0.15x = 82.5 - 9 = 73.5

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x = 490

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