book Maths Puzzle Numerical Ability

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

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book Other Question

Illustrate and explain the following operations using letters: B for black chips (+) and R for red chips (-).
(a) 8 + -3

(b) -2 + 4

(c) 3 + -5
How do I Find the mean.
1, 6, 10, 11, 12