exam Maths Puzzle Numerical Ability

One pipe can fill a tank in 6 hours, and another pipe can fill the same tank in 8 hours. How long will it take to fill the tank if both pipes are used?

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exam Other Question

Use the ac test to determine which of the following trinomials can be factored. Find the values of m and n for each trinomial that can be factored.

x squared - x + 2 Solve for n

7n+2[3(1-n)-2(1+n)]=14

I ggot the answer as 10, but when my mom checks it she cannot make it work.