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30 Jul 2007, 07:47
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8. Three quarts of chemical A contain 10% of hydrogen peroxide. A different chemical B, which contains 40% of hydrogen peroxide, will be mixed with the 3 quarts of A. How much B should be added to the A so that the resulting mixture contains 30% of hydrogen peroxide?
A.2
B.3
C.4
D.5
E.6
A.2
B.3
C.4
D.5
E.6
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30 Jul 2007, 08:22
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jet1445
E.
3 (0.1) + b(0.4) = 0.3 (3+b)
.3 + .4b = .9 + .3b
.4b - .3b = .9 - .3
b = .6/.1
b = 6
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