exam Maths Puzzle Numerical Ability

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2x - (4x + 3) < 6x + 3(x + 4)

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exam Other Question

A jar contains 5-gram bolts and 10-gram bolts. The contents of the jar weigh 2.35kg. If there are 300 bolts altogether, how many are there of each kind? cannot figure this out..: let f(x)=x^3-1 and g(x)=x^2+x+1. find (f/g)(x).