SOLUTION: how many bags of 7% cement should be mixed with 4 bags of 17% to produce a mix containg 11% cement

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Question 684327:
how many bags of 7% cement should be mixed with 4 bags of 17% to produce a mix containg 11% cement
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
.07X+.17*4=.11(4+X)
.07X+.68=.44+.11X
.07X-.11X=.44-.68
-.04X=-23
X=-.24/-.04
X=6 BAGS OF 7% IS USED.
PROOF:
.07*6+.17*4=.11(4+6)
.42+.68=.11*10
1.1=1.1