Question

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

Answer 1

HEYA!!


TOTAL STUDENTS = 20

PERSENTAGE OF GOOD STUDENTS = 75%


SO, TOTAL GOOD STUDENTS = 75% of 20
$\boxed{ = \: 75/100 \: × \: 20}$


AFTER SOLVEING

15 WILL BE LEFT


SO, STUDENTA NOT GOOD IN MATHS = TOTAL STUDENTS - GOOD STUDENTS
= 20 - 15
=$\boxed {5 \: STUDENTS }$


HOPE IT HELPS U

Answer 2

Total number of students = 20

Percentage of students good in mathematics = 75 %

Number of students good in mathematics = 75 % of 20 students

= 75/100 * 20 = 3/4 * 20 = 3 * 5 = 15 students

So, number of students not good in mathematics

= Total number of students - Number of students good in mathematics

=20 - 15 = 5 students

Answer : 5 students are not good in mathematics.

OR

Percentage of students good in mathematics = 75 %

So, percentage of students not good in mathematics

= Total percentage of students - Percentage of students good in mathematics

= 100 - 75 = 25 %

So, number of students not good in mathematics = 25/100 * 20

= 1/4 * 20 = 5 students

Answer : 5 students are not good in mathematics.

Hope it helps!

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