Question

20. 72% of 25 students are good in mathematics.
How many are not good in mathematics?
[AMU:2015-1
(a) 26%
(b) 32%
(c) 30 %
(d) 28 %​

Answer 1

Answer:

d) 28%

Step-by-step explanation:

Percentage of students good in Maths = 72%

According to the Q,

Percentage of students not good in maths:

>> 100 - 72

>> 28%

OR

No: of students good in Maths:

>> 72% of 25

>> 72/100 x 25

>> 72/4

>> 18 Students

So, No: of students weak in Maths:

>> 25 - 18

>> 7

Therefore , Percentage of students not good in maths:

Let "x" be the Percentage.

>> x% of 25 = 7

>> x/100 x 25 = 7

>> x/4 = 7

>> x = 7 x 4

>> x = 28%

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Answer 2

Answer:

d) 28%

which is = to 7 students not good in mathematics

Step-by-step explanation:

72% of 25 students are good in mathematics

step 1. you say 100% - 72% = 28% to get the percentage of students that are not good in mathematics.

to get the number of students that are not good you the say

28/100*25 to get the number of students

= to 7 students are not good in mathematics.

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