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해법
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15 is 40 percent of what numberThe sum of three consecutive even integers is-108The population of a city increases by 5% per year. If this year's population is 168,000, what will next year's population be, to the nearest individual?john has 4 apples and gives them to his 2 friends. how many apples does each friend get?Find the radius of a 원형 with an area of 25 square units.