SOLUTION: Sam needs 3 lb of metal with 43% silver. If sam combines one metal with 18% silver, and another with 80% silvet, how much metal does he need?
Question 991979: Sam needs 3 lb of metal with 43% silver. If sam combines one metal with 18% silver, and another with 80% silvet, how much metal does he need? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = pounds of 18% silver needed
Let = pounds of 80% silver needed
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(1)
(2)
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(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)
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and
(1)
(1)
1.79 pounds of 18% silver are needed
1.21 pounds of 80% silver are needed
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check:
(2)
(2)
(2)
(2)
OK
