Archie is playing with his marbles outside. He loses 60% of them into the street. Of the remaining ones, he loses half down a sewer. If he has 20 left, how many did he start with?
Let's be accurate as possible. Think before you answer.
100
He had 40 before losing them into the sewer because 20 x 2 = 40.

He started with 100 because 40 /.

4 = 100.

.

Therefore, the answer is 100