exam Maths Puzzle Numerical Ability

Anne and Nancy use a metal alloy that is 21.22% copper to make jewelry. How many ounces of a 16% alloy must be mixed with a 25% alloy to form 100 ounces of the desired alloy?

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exam Other Question

Solve the equation w=Cr-2 for r where C is a constant and r is the distance that the object is from the center of the earth. solve equation, by making appropriate substitution.

a)x^-2+x^-1-56=0
U=
U^2=

b)x^2/3-x^1/3-12=0
x=
x^2=