book Maths Puzzle Numerical Ability

can u please show me how to do this problem:


the square root of (2x+5) - the square root of (x-2) = 3

I got the answer of 2, but i believe there is another possible answer,

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book Other Question

solve

Seventy two students are separated into two groups.the first group is 5 times as large as the second. How many students are in each group?
please help me solve the equation:

x/16 - 5/8 = x + 6/8