exam Maths Puzzle Numerical Ability

Find the GCF for 85, 136, and 170.

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exam Other Question

I need to know how to simplify these type of problems out:
3x+2 is equal or lesser to 4x+1 The pressure P of a gas at constant temperature varies inversly as the volume V. If V +600 inches cubed when P+45 lbs/inches squared, what is P when V+ 54 inches cubed?