exam Maths Puzzle Numerical Ability

find four consecutive odd integers such that the sum of the first and fourth is 55 greater than the opposite of the third

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I need help learning fractions and geting them stuck in my memory. I have flunked more than 5 math tests because I forget the meterial. If the probability that at least one person makes an A on the final exam is 0.15, then the probability no one makes an A is: