book Maths Puzzle Numerical Ability

please solve this equation: I = prt , solve for p

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book Other Question

If two numbers differ by 6, then what is the least possible value of their product? I am having trouble getting problems into the quadratic form, for instance I don't undersatnd how to do put this problem into the right form.
(x+1)^2+2(x-2)=(x+1)(x-2)