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Represent the number with
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25% of what number is 7The present age of Alex is four times the present age of his son. Five years ago, the sum of their ages was 35 years.Find their present ages.60 is 24% of what numberwhat is the balance after 7 years if 54000 is invested at 6% compound annuallyfind the 원둘레 of a circle having 3.1 cm of diameter