IDNStudy.com, ang iyong gabay para sa malinaw at eksaktong mga sagot. Tuklasin ang libu-libong mga sagot na na-verify ng mga eksperto at hanapin ang mga solusyong kailangan mo, anuman ang paksa.

Imagine that you took 12 steps up using the stairs in a 2-storey building.After a short while,you decided to go down because you need to pick your ballpen which fell on the 5th step from the ground.
Question:
a. How many steps should you take to pick the ballpen?_____________
b.How did you come up with your result?_____________