Question

80% of 40 students are good in English find how many are not​

Answer 1

Answer:

Hint: As we know that the total number of students is 40. And as the percentage of good students is known so we can calculate the percentage of students who are not good in mathematics using(100−good%)

. Hence, we calculate the number of students who are not good in maths using the above number of percentage of those students who are not good in mathematics, by using the formula, n%ofA=n/100×A

Step-by-step explanation:

100-80=20

(20/100) ×40=20/2.5

on dividing 20 by 8

Number of students who are not good in maths=8

Hence, the total number of students not good in mathematics is 8

Answer 2

Answer:

16 students are not good in English

Step-by-step explanation:

No of students who are good in English= 80% of 40

80% of 40 is 24.

so we get to know that 24 students are good in English.

No of students not good in English= 40-24= 16

So 16 students are not good in English.

Hope you understood