book Maths Puzzle Numerical Ability

Good evening. I would like to ask u to solve me this problem.
I think this is a simple problem that i spent many of times to solve but i could not .
PLease would

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book Other Question

create an equation or inequality that could be used for analysis, prediction, or decision making. use the ratio of women to men graduating high school.
female = 1,916
male = 1,60
please help

solve

20 over x = 20 over x - 4 + 4 over x

show work