exam Maths Puzzle Numerical Ability

Find all sets of three consecutive multiples of 11 for which the sum of the lesser numbers is greater then 100 and the sum of the two greater numbers is less than 200

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The cost C, in thousands of dollars, to remove p% of the pollutants in a lake is given by C(p) = 50p / 100-p, 0 < or equal to p < 100. Find the cost of removing 20% of the pollutan I am not sure if I need a formula or not, but I am trying to figure out the dimensions of each side of a 9 foot by 9 foot octagon. Any help would be greatly appreciated. Thank yo