exam Maths Puzzle Numerical Ability

(3)/2y-(3)/2y+4

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exam Other Question

9X^2+9=0
A.-1,1
B.-1i,1i
c. 3i,3i
d. -9i,9i Dr. Kingsley took 60 ounces of a 20% gold alloy and mixed it with a 30% gold alloy to get a 24% gold alloy. How many ounces of the 30% gold alloy did he use?