book Maths Puzzle Numerical Ability

please help me solve this: (4p-7q)+(5q-8p)

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book Other Question

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? if a/x-b/y=c and xy=1/c, then bx=