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March 29, 2015

March 29, 2015

Posted by **sh** on Sunday, October 21, 2012 at 7:36pm.

- algebra -
**Reiny**, Sunday, October 21, 2012 at 9:19pmlet amount of 7% solution be x L

then the amount of 15% solution must be 12-x L

.07x + .15(12-x) = .10(12)

times 100

7x + 15(12-x) = 120

7x + 180 - 15x = 120

-8x = -60

x = 7.5

She should use 7.5 L of the 7% and 4.5 of the 15% solution

check:

.07(7.5) + .15(4.5)

= 1.2

and 10% of 12 L is 1.2

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