exam Maths Puzzle Numerical Ability

Help! I am a bit confused!
Here is my problem: "The square of the sum of a number and 5 is 36. Find the numbers."

Are they asking me to find the square of 31? (since 31+5=36)... I am a little lost...

Please help! Thank you!!

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exam Other Question

Solve. 4 - a-4/a+5 = a^2-16/a+5

Thank you in advance. If a freight train and an express train leave town 390km apart, traveling towards one another. The freight train travels 30km slower than the express train they pass one another 3hours later. What are their speeds?