Question

a box contains 1000 balls in two colors , red and blue if the number of red balls is 700 find the number of blue balls in the box

Answer 1

Total number of balls is 1000

Red balls are 700

Number of blue balls will be

`\begin{gathered} 1000-700 \\ =300 \end{gathered}`

Hence the number of blue balls is 300.

So you simply subtract 700 from 1000 to get 300.