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September 22, 2014

September 22, 2014

Posted by **James** on Sunday, January 15, 2012 at 9:30am.

- Mathematics -
**Reiny**, Sunday, January 15, 2012 at 10:15amLet the amount of the $2.50 coffee be x kg

then the amount of the $3.50 coffee will be 20-x kg

2.5x + 3.5(20-x) = 2.8(20) = 56

times 10

25x + 35x(20-x) = 560

25x + 700 - 35x = 560

-10x = -140

x = 14

He should mix 14 kg of the $2.50 and 6 kr of the $3.50 coffee.

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