exam Maths Puzzle Numerical Ability

hlp

4A/3=1/2b^2c^2d for c

thanks for u'r time

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exam Other Question

To meet the governments specifications, an alloy must be 65% aluminum. How many pounds each of a 70% aluminum alloy and a 54% aluminum alloy will be needed to produce 640 pounds of the 65% aluminum alloy?

Any help with this one is appreciated! I have worked this problem, but I am not confident that I have it 100% correct, any insight would be appreciated!
You are loaded into a ferris wheel car. The wheel turns at 4 rpm