Saved Bookmarks
| 1. |
A man's age after 15 years will be the square of his age 15 years ago. What is it's present year |
|
Answer» -LET the man’s PRESENT age = x. x+15 = (x-15)^2, or x+15 = x^2–30x+225, or x^2–31x+210 = 0 (x-21)(x-10) = 0 x = 21 or 10. Here 10 has no RELEVANCE. So the man is 21 years now, Check: (21–15) = 6^2 = 36 same as 21+15 or 36. Correct.It was very EASY I hope it helps |
|