Caroline had 400 stamps in her collection. 1/10

th of them were Indian stamp. Of the remaining, 1/ 3 were Europe, and 100 stamps were from Africa. The rest were from United states of America. How many American stamps were there?

2 answers

1/10 of 400 is 40,
So now you're down to 360 stamps.
Now you take the next steps.
140 stamps