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September 20, 2014

September 20, 2014

Posted by **jay** on Monday, July 5, 2010 at 11:59pm.

- math -
**Reiny**, Tuesday, July 6, 2010 at 12:18amNumber of kg of 45% alum .... x

number of kg of 70% alum .... 20-x

solve for x

.45x + .70(20-x) = .60(20)

(I suggest multiplying each of the 3 term by 100 first)

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