exam Maths Puzzle Numerical Ability

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:

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exam Other Question

find four consecutive odd integers such that the sum of the first and fourth is 55 greater than the opposite of the third Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770 in interest. How much was invested at 8%?