book Maths Puzzle Numerical Ability

x/4-x/5=-1/2

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book Other Question

1.(3x+4)(x+5) 2.ax-7bx+ay-7by 3.subtract 2n2-5n-6and-8n2+n+6 from-11n2-n+5
4.find the product (x8n-2)(x6) if x=5 and y=36 what is x92+y834