An alloy of silver and gold is to be recast with an addition of silver. The alloy consists of 80 ounces, 10 ounces of which are gold. If the new alloy is to have only one-fifth of an ounce of gold in 5 ounces, how much silver must be added?
170 ounces
77 ounces
4 ounces
Answers: 1
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