book Maths Puzzle Numerical Ability

i could really use your help in this one! the total of eight times a number and fifteen is thirty-one. find the number. thanks

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book Other Question

Find all the zeros in the function
f(x)=x^5+15^3=100x
where the zeros A,B,C, are real numbers with A<B<C
A=
B=
C= I have a problem that says to simplify. I can get as far as the square root of 68. The correct answer is 2 sqaure roots of 17. Can you tell me the steps please to get to that point?