AMC10每日一题（2000年真题#3）

2000 AMC 10 竞赛试题/第3题

Problem

Each day, Jenny ate20% of the jellybeans that were in her jar at the beginning of that day. At the end of the second day, 32remained. How many jellybeans were in the jar originally?

Solution

Since Jenny eats of her jelly beans per day, 80%=4/5of her jelly beans remain after one day.

Let be the number of jelly beans in the jar originally.