Question 1198083
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The response from the other tutor shows a standard algebraic solution method.<br>
Here is a much faster and easier way to solve any 2-part mixture problem like this -- if you understand it, and if a formal algebraic solution is not required.<br>
Look at the three costs per 12 ounces -- 50, 70, and 85 -- (on a number line, if it helps) and observe/calculate that 70 is 20/35 = 4/7 of the way from 50 to 85.<br>
That means 4/7 of the mixture must be the higher priced ingredient.  So...<br>
ANSWERS:
pineapple: (4/7) of 84 ounces = 4*12 = 48 ounces
grapefruit: (3/7) of 84 ounces = 3*12 = 36 ounces<br>
CHECK:
48(85)+36(50) = 4080+1800=5880
84(70) = 5880<br>