Question: Emily bought 9 packs of candy necklaces to give her classmates at school for Valentine's Day. Each pack had 8 candy necklaces in it. Emily opened one pack at a time. After her classmates took as many as they wanted, there were 40 candy necklaces left. How many packs did Emily open for her classmates? Think carefully first, then make a decision:
Emily bought 9 packs of candy necklaces * 8 candy necklaces in a pack = 72 candy necklaces. Her classmates took 72 candy necklaces 40 candy necklaces left = 32 candy necklaces. Since each pack contained 8 necklaces, this means 32 / 8 = 4 packs of candy necklaces were opened. So the answer is 4.