Answer for Day 4 Problem
@chrisrice is 35 years old and @jancharlest is 22 years old (at present). 🎯
Let x be the present age of @jancharlest in years. Since @chrisrice is 13 years older than @jancharlest, let (x + 13) be the age of @chrisrice.
When we look at 9 years ago, the age of @jancharlest was (x - 9) and the age of @chrisrice was (x + 13 - 9) or simply (x + 4). Since it was stated in the original problem that 9 years ago, the age of @chrisrice was twice the age of @jancharlest, our equation can be worded into: "The age of @chrisrice plus 4 is equal to 2 times the age of @jancharlest after deducting 9 from it", or simply (x + 4) = 2 * (x - 9).
| Present | Past (9 years ago) | |
|---|---|---|
| @jancharlest | x | x - 9 |
| @chrisrice | x + 13 | x + 4 |
(x + 4) = 2 * (x - 9)
x + 4 = 2x - 18
x - 2x = -18 - 4
-x = -22
x = 22
Since we represented the present age of @jancharlest as x years old, and the value of x is 22, his age in years is 22. Since @chrisrice is 13 years older than @jancharlest, the age of @chrisrice in years is (22 + 13) or simply 35.
Winner: @jfang003 🏅
1 HIVE has been sent to @jfang003's account as reward. 💰 @jfang003 also won yesterday! 🤓
Mentions: @holovision and @ahmadmanga (@ahmadmangazap)
Special mentions: @chrisrice and @jancharlest 😆
RE: Day 4 Problem of my Math mini-contest for D.Buzz 😎