book Maths Puzzle Numerical Ability

how do you pull the info out of the problem?

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Hi,

I am wondering if there's a way to express the proportion of THREE quantities as a decimal, or if there is a formula to express the proportion of each of the quantities othe I need helping solving this:

one eighth of the square root of 7 less than a number is 2. what is the number?

I believe it should look like this

1/8 square root 7