Question

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

Answer 1

students good in math = 72%

students good in math = 72%Total no. of students= 25

students good in math = 72%Total no. of students= 25then, percent are used to have 100.

students good in math = 72%Total no. of students= 25then, percent are used to have 100.Therefor, 72×25÷100

students good in math = 72%Total no. of students= 25then, percent are used to have 100.Therefor, 72×25÷100= 18

students good in math = 72%Total no. of students= 25then, percent are used to have 100.Therefor, 72×25÷100= 18Then , no of students good in math = 18

students good in math = 72%Total no. of students= 25then, percent are used to have 100.Therefor, 72×25÷100= 18Then , no of students good in math = 18Total no. Of student = 25

students good in math = 72%Total no. of students= 25then, percent are used to have 100.Therefor, 72×25÷100= 18Then , no of students good in math = 18Total no. Of student = 25Therefore, Students not good in maths = total no. of students - no. Of students good in maths

students good in math = 72%Total no. of students= 25then, percent are used to have 100.Therefor, 72×25÷100= 18Then , no of students good in math = 18Total no. Of student = 25Therefore, Students not good in maths = total no. of students - no. Of students good in maths= 25–18

students good in math = 72%Total no. of students= 25then, percent are used to have 100.Therefor, 72×25÷100= 18Then , no of students good in math = 18Total no. Of student = 25Therefore, Students not good in maths = total no. of students - no. Of students good in maths= 25–18= 7

• students good in math = 72%Total no. of students= 25then, percent are used to have 100.Therefor, 72×25÷100= 18Then , no of students good in math = 18Total no. Of student = 25Therefore, Students not good in maths = total no. of students - no. Of students good in maths= 25–18= 7The no. Of students not good in maths are 7.

Answer 2

Step-by-step explanation:

30/100 ×20 = 30 × 5 = 150 are not good in science.

hope it helps you