Question. Every time she goes to the store, Felicity gets a lollipop. After she finishes them, she uses the sticks to build a fort. The fort needs 400 sticks to finish it. Her family goes to the store three times a week and she always goes. If the fort is 60% complete, how many weeks has Felicity been collecting lollipops for?
Answer. 80
What step-by-step reasoning justifies that answer?
Reasoning: She has 240 sticks because 400 x .6 = 240. She has been going to the store for 80 weeks because 240 / 3 = 80.