Question

$60\%$ of oranges in a basket were spoilt. If the basket contained $640$ oranges,

Find the number of good oranges.

Answer 1

Step 1 : Find the percentage of good oranges first, since total percentage is $100$, we subtract percentage of spoilt oranges from $100$

$100-60=40$

so $40\%$ of the oranges are good oranges.

Step 2 : Convert the given percentage to fraction by dividing it with $100$,

$\frac{40}{100}$ is the required fraction

Step 3 : Since $40\%$ of the oranges were good, if we multiply it with the total number of oranges we will get the number of good oranges.

$$\begin{gathered} =\frac{40}{100}\times 640 \\ =\frac{4}{10}\times 640 \\ =4\times 64 \\ =256 \end{gathered}$$

Hence $256$ oranges are good