Question

70% of 20 students are good in mathematics. how many students are not good in mathematics?

Answer 1

» Total students = 20

» According to question :-

» 70% of 20 :-

$= > \frac{20 \times 70}{100} = 14$
_____________[ANSWER]


Hence , 14 students are goods in mathematics

Answer 2

This can easily solved by using a calculator:

70% becomes the decimal .70

You multiply the decimal by the number 20

.70 times 20 equals 14

Which means 14 students are good at math

Since 14 students are good at math out of a total of 20

20 minus 14 equals 6

6 students are not good in mathematics