exam Maths Puzzle Numerical Ability

A researcher polled 260 students at a university and found that 83 of them owned a laptop computer. Estimate the probability that a randomly selected college student owns a laptop computer.

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exam Other Question
one-half of pias age two years from now plus one-third of her age three years ago is 20 yrs. How old is she now? If (x-1)^4+(x-5)^4-8=0

what is the value of

x^3+6x+2