book Maths Puzzle Numerical Ability

n-1/n=7/12
solve for n.

thanks for any help.

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book Other Question

2/3y+v=s solve for y Please help. I need to find the surface area and volume of a sphere. I have a drawing of a sphere and 34in is written in the middle. Is this the radius or the diameter, can someone help me, I have been working on this problem for weeks.