Question

The distance from your house to the ice cream shop is 12 miles. Your best friend’s house is on the segment between your house and the ice cream shop, and his house is 3 miles from the ice cream shop. How many miles

Answer 1

Your house                      Friend's House               Ice cream house
Ф⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒12 miles
                                              Ф⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒ 3 miles
Ф⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒ ?

The distance of your house to your friend's house is 9 miles.

12 miles - 3 miles = 9 miles.