book Maths Puzzle Numerical Ability

16x^2-8x+1

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Is S varies directly as t^2,s=150 when t=5, find s when t=4 There are 100 members of the picky eaters club. only 15 of them have tried both cauliflower and spinach. altogether, 72 of them have never tried cauliflower and 81 have never tried