Question

$72$ % of $25$ students are good in mathematics. How many are not good in mathematics?

Answer 1

It is given that $72$ % of $25$ students are good in mathematics.
Therefore,
Percentage of students who are not good in mathematics = $(100 - 72)$ %
= $28$ %
∴Number of students who are not good in mathematics = $\frac{28}{100}×25$
= $7$
Thus, $7$ students are not good in mathematics.