exam Maths Puzzle Numerical Ability

a contractor has a 24-pound mixture that is no-fourth cement, and three-fourths sand. How much of a mixture that is half cement and half sand needs to be added to produce a mixture that is one-third cement?

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exam Other Question

If the sales tax rate is 2.5% and the tax on a purchase is $5, what was the amount of the purchase?

Can someone help me out with this?
Eddie Business and finance. A country exported $60,000,000 less than it imported, creating a negative trade balance.
I need to come up with a number not sure how to Please help!!