exam Maths Puzzle Numerical Ability

Amy paid 87.24 for a pair of running shoes during a 30% sale. What was the regular price?

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How much pure water must be mixed with 4 pints of 90% developer to produce a mixture that is 19% developer? suppose that a 5-digit number is randomly generated using digits from the sets {2,3,4,6,7}. find the probability that the number has no repeated digits.