exam Maths Puzzle Numerical Ability

I need help with this problem and would appreciate if anyone could help me solve it. Thank you.

n + 5 3/10=8 1/10, find the value of n.

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exam Other Question

M is the midpoint of QR. Q has coodinates (-3,5) and M has coordinates (7,-9) find the coordinates of R. write an equation that expresses the relationship. Use k as the constant of variation.
d varies directly as the square of y

a) d= k sqrt y

b) d= k/sqrt y

c) d= ky^2

d) d= k/ y^2