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(a-b)(a^2 + something + b^2) What does something need to be to get rid of the extra terms when you multiply (a-b)(a^2+b^2)

1 banana = 1/4 lb 1 strawberry = 23g = 1/20 lb 8 strawberries = 23g = 4/10 lb

Suppose you have 5 lb of a smoothie mixture that is 1/4 bananas and 3/4 strawberries. You would prefer a smoothie mixture that is 1/2 bananas and 1/2 strawberries. Your friend brings over 200 lbs of a mixture that is 9/10 bananas and 1/10 strawberries. (It's on the moon, so it doesn't seem to weigh as much) How much of that mixture should you combine with your excessive strawberry mixture to make a half-and-half mixture?