book Maths Puzzle Numerical Ability

what is the solution to z/20+1/12=z/15-1/10 and 4W+23/5=19-W/7

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book Other Question

find the value of
5 X 10^-5
_____________
25 X 10^3
A cyclist bikes x distance at 10 miles per hour and returns over the same path at 8 miles per hour. What is the cyclist抯 average rate for the round trip in miles per hour?