Lời Giải
Lời Giải
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Ví dụ phổ biến
The 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 chu vi of a circle having 3.1 cm of diameterWhen a number is increased by 9.5%, the result is 58. What is the original number to the nearest tenth?