Question

# A garden has 2000 trees. 12% of these are mango trees, 18% lemon and the rest of orange trees. Find the number of orange trees.

Number of mangoes will be $\dfrac{{2000 \times 12}}{{100}}$ which is equal to $240$. Number of lemon trees will be $\dfrac{{2000 \times 18}}{{100}}$ which is equal to $360$. Total number of oranges will be equal to the difference of the number of total trees and the total of the rest of the trees. So, the number of orange trees will be equal to $2000 - (240 + 360) = 1400$.
Note: Here to convert percentage into numbers we have used $\dfrac{{{\text{total number of trees}} \times {\text{total percentage of the specific trees}}}}{{100}}$. Alternatively, we can use the fact that the total percentage is 100%. So we can find the percentage of orange trees first and then use the above mentioned formula to find no. of orange trees.