book Maths Puzzle Numerical Ability

How do I Find the mean.
1, 6, 10, 11, 12

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book Other Question

I have 5 units out of 36 in compliance with a regulation. How do I figure out what percentage that is?

36 divided by 5 = 7.2%
5 x 100 divided by 36 = 13.8

Which is the corre translate "three plus one-half of a number is ten" into an equation and solve. thank-you