book Maths Puzzle Numerical Ability

sqrt x =12-x

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book Other Question

help me solve this equation
11/5x + 36/5 = 7/2

my answer is
2(11x) + 36(2) = 35

22x + 72 = 35
-72 -72
22x/22 = 3 -37/22 x=-37/22 1 over x-1 minus 2 over x-2 plus 1 over x-3