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March 5, 2015

March 5, 2015

Posted by **myla** on Sunday, July 15, 2012 at 12:55am.

- math -
**PsyDAG**, Sunday, July 15, 2012 at 11:45amD = 3Q

10D + 25Q = 990

Substitute 3Q for D in second equation and solve for Q. Insert that value into the first equation and solve for D. Check by inserting both values into the second equation.

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