book Maths Puzzle Numerical Ability

Jennifer, Stephanie, and Rosalyn made a total of 60 downhill runs. Jennifer made 18 runs and Stephanie made three fourths as many runs as Rosalyn. How many runs did Rosalyn make?

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Please help - getting stuck with this absolute value problem:

2x+3>= -13 Let f(x) =x^n + a(sub1)x^n-1 + a(sub2)x^n-2..........a(sub n-1)x+a(sub n) be a polynomial with integer coefficients. Suppose there are four distinct integers a,b,c and d such that f(a)=f(b)=f(c)=f(d)=8. Can there be an integer k such that f(k)=3.