exam Maths Puzzle Numerical Ability

thirty percent of the sulfur desiccated. If 42 tons did not desiccate, how much sulfur was there in all?

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exam Other Question

x^2+(x+21)^2=(x+24)^2 Hi Free Tutors!
Here is my problem:

A hole is 33 feet deep and 3 feet in circumference. How many yards of concrete will it take to fill it?

Thanks!
NR