book Maths Puzzle Numerical Ability

15j+10j+8=11

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book Other Question

Put four different numbers in a circle so that when you add the numbers at the end of each line you always get a square number.
( where circle in the figure represents each of the
y=x+5
how do i solve this
the answer is...

y is equivalent to the sum of a constant c and x, where c =5