Question

75% of 20 students are good in mathematics. how many are not good in mathematics.
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Answer 1

25% are not good in mathematics.
25*20/100=5

Answer 2

Given: 75% of 20 students are good at mathematics.

To Find: how many are not good at mathematics.

Number of students good at mathematics=

75% x 20

=75/100 x 20

=75/10 x 2

=75/5

=15

Number of students not good at mathematics=

20-15 (because the rest of 25% are not good at mathematics)

=5

ANS. 5 students are not good at mathematics out of 20.