Question

30% of 20 students are good in science. How many are not good in science​

Answer 1

if , students good in math = 72%

Total no. of students= 25

then, percent are used to have 100.

Therefor, 72×25÷100

= 18

Then , no of students good in math = 18

Total no. Of student = 25

Therefore, Students not good in maths = total no. of students - no. Of students good in maths

= 25–18

= 7

Answer 2

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Given :

• Total number of students = 20
• Percentage of students good in science = 30%

To find :

Number of students not good in science

Solution :

Number of students good in science = 30/100 × 20 = 6

Therefore, number of students not good in science = 20 - 6 = 14