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January 30, 2015

January 30, 2015

Posted by **Alexis** on Monday, May 12, 2014 at 9:41pm.

- math -
**Kuai**, Monday, May 12, 2014 at 10:37pmAdult: x

Student: y

x + y = 90

12x+ 8y = 980

12x +8(90-x) = 980

12x + 720 -8x = 980

4x = 260

x = 65

y = 25

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