Question 1198083
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Grapefruit  50 cents per can
Pineapple 85 cents per can
MIXTURE is for 7 "cans" at 70 cents per can.


Account for cost.
w cans of the pineapple

7-w cans of the grapefuit

{{{85w+50(7-w)=70*7}}}

Solve for w, the number of cans of the pineapple.


{{{(85-50)w=70*7-50*7}}}

{{{highlight(w=7((70-50)/(85-50)))}}}


{{{w=7(20/35)=7(4/7)=4}}}

{{{highlight(w=4)}}}-----------four cans of the pineapple.


This means 8 cans of the grapefuit.