book Maths Puzzle Numerical Ability

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)

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book Other Question

Boiling water, at 100C is placed in a freezer at 0 degree celsius. The temperature of the water is 6 degree celsius after six minutes. What is the temperature after 2 hours? x/4-x/5=-1/2