Date: November 1, 1999.
Skills required: Being able to add
and subtract numbers up to 20.
Target audience:Grades 3-4
Deadline to submit the solution:
December 1, 1999.

A snail is climbing up a 15 feet tall tree.
During the day it climbs 3 feet up the tree and during the
night it slides backward 2 feet.

Q1. After how many days will the snail reach the top
of the tree?