caroline had 400 stamps in her collection. 1/10th of them were indian stamps. of the remaining were 1/3 were from Europe and 100 stamps were from africa. the rest were from united states of america. how many were from america?

Dear Student,
Please find below the solution to the asked query:
$$\begin{gathered} \mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{stamps}=400 \\ \mathrm{Number} \mathrm{of} \mathrm{Indian} \mathrm{stamps}=400\times \frac{1}{10}=40 \\ \mathrm{Remaining} \mathrm{stamps}=400-40=360 \\ \mathrm{Number} \mathrm{of} \mathrm{stamps} \mathrm{from} \mathrm{Europe}=360\times \frac{1}{3}=120 \\ \mathrm{Number} \mathrm{of} \mathrm{stamps} \mathrm{from} \mathrm{Africa}=100 \\ \mathrm{Number} \mathrm{of} \mathrm{stamps} \mathrm{from} \mathrm{America}=360-\left(120+100\right) \\ =360-220 \\ =140 \end{gathered}$$
Hope this information will clear your doubts about rational number.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.