@savvyplayer: Answer for Day

Answer for Day 4 Problem

Let x be the present age of Hive account@jancharlest in years. Since Hive account@chrisrice is 13 years older than Hive account@jancharlest, let (x + 13) be the age of Hive account@chrisrice.

When we look at 9 years ago, the age of Hive account@jancharlest was (x - 9) and the age of Hive account@chrisrice was (x + 13 - 9) or simply (x + 4). Since it was stated in the original problem that 9 years ago, the age of Hive account@chrisrice was twice the age of Hive account@jancharlest, our equation can be worded into: "The age of Hive account@chrisrice plus 4 is equal to 2 times the age of Hive account@jancharlest after deducting 9 from it", or simply (x + 4) = 2 * (x - 9).

	Present	Past (9 years ago)
Hive account@jancharlest	x	x - 9
Hive account@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 Hive account@jancharlest as x years old, and the value of x is 22, his age in years is 22. Since Hive account@chrisrice is 13 years older than Hive account@jancharlest, the age of Hive account@chrisrice in years is (22 + 13) or simply 35.