exam Maths Puzzle Numerical Ability

solving rational equations and expressions

50 over t-2 + 5 over x = 1 over x^2+x

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exam Other Question

A class of 40 students is to divided into smaller groups. If each group is to contain 3,4 or 5 people, what is the largestnumber of groups possible? Simplify:

square root of 15x^6 * the square root of 16x^5

I got the answer 4x^5 square root of 15x. Is this correct? Thanks so much!!