Update README.md

README.md

@@ -50,6 +50,52 @@ cost per apple: 6 / 0.5 = 12 apples.
 So, you now have a total of 36 apples.
 
 As for the river, it's not specified which city it runs near, so we can't pinpoint its exact location. But at least you found those coins!
+
+>>> Two years ago, I was three times as old as my brother was. In three years, I will be twice as old as my brother. How old is each of us now? 
+Let's define the current age of you and your brother with variables.
+
+You are Y years old.
+Your brother is X years old.
+
+Two years ago:
+You were Y - 2 years old (because we're looking back in time).
+Your brother was X - 2 years old.
+
+Since two years ago, you were three times as old as your brother was, the equation would be:
+
+Y - 2 = 3(X - 2)
+
+Simplify and solve for X:
+
+Y - 2 = 3X - 6
+Y = 3X - 4
+
+Now we know that Y (your current age) is three times your brother's age minus four. Let's use this to find your current age.
+
+In three years:
+You will be Y + 3 years old.
+Your brother will be X + 3 years old.
+
+Since in three years, you'll be twice as old as your brother:
+
+Y + 3 = 2(X + 3)
+
+Simplify and solve for X (your brother's current age):
+
+Y + 3 = 2X + 6
+Y - 2X = 3
+(3X - 4) - 2X = 3
+X - 4 = 3
+X = 7
+
+Now that we have your brother's current age, we can find yours:
+
+Y = 3X - 4
+= 3(7) - 4
+= 21 - 4
+= 17
+
+So you are currently 17 years old, and your brother is 7 years old.
 ```
 
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