exam Maths Puzzle Numerical Ability

Given h(x)=-3(3-x)/x, solve for h(x+a)-h(x).

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exam Other Question

can someone help me simplify (6i)^2 ? A painter works on a job for 10 days and is then joined by her helper. Together they finish the job in 6 more days. Her helper could have done the job alone in 30 days. How long would it have taken the painter to do the job alone?