Question

72% of 25 students are good in mathematics. How many are not good in mathematics? .

Answer 1

Answer:

total students =25

good at math = 72% of 25

= (72÷100)×25

=18 students are good at math

Students not good at math = 25-18=7

Answer 2

$\textbf{Question -}$

• 72% of 25 students are good in mathematics. How many are not good in mathematics?

$\textbf{Solution -}$

• Total percentage of students who are good in mathematics and not good in mathematics = 100

• 72% + percentage of students who not good in mathematics = 100

• Percentage of students who not good in mathematics = 100 – 72 = 78

• Number of students who not good in mathematics = 28% of 25

• $\frac{28}{100} \: \times \: 25 \: = \: 7 \: students$