SOLUTION: Whites varied directly as yellows cubed and inversely as purples. when there were 250 whites, there were 5 yellows and 8 purples. how many whites were there when there were 7 yello

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Question 1149332: Whites varied directly as yellows cubed and inversely as purples. when there were 250 whites, there were 5 yellows and 8 purples. how many whites were there when there were 7 yellows and 4 purples
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
w, whites
y, yellows
p, purples
k, variation constant

w=ky%5E3%2Fp
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k%28y%5E3%2Fp%29=w
k=wp%2Fy%5E3
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k=250%2A8%2F5%5E3
k=16
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how many whites were there when there were 7 yellows and 4 purples?
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w=16%28y%5E3%2Fp%29
Substitute for the given values.