book Maths Puzzle Numerical Ability

this is the question:
prove that:
(x/a)+(y/b)=1

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book Other Question

The midpoints of square ABCD are connected to form square EFGH. If EF=10units,
what is the area of squareABCD? Could u solve this please?
5psquared - no () P=2
do you work from left to right? OR square first? HELP