Imagine I gave you a large bag of push pins. This bag of push pins weighs 84.6g. 10 push pins weigh 4.7g. How many push pins are in the bag?

If 10 push pins weigh 4.7g, then one push pin weighs 0.47g. Since the bag is 84.6g, calculate 84.6 ÷ 0.47 = 180 push pins. There are 180 push pins in the bag.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.