Question

$20$% of students in college are seniors. $40$% of seniors are taking a math class. What percentage of students in college are seniors enrolled in a math class?

• A. $8$%
• B. $30$%
• C. $40$%
• D. $60$%
• E. $80$%

Answer 1

Answer: (A)

$8$%

$\Rightarrow$ Let there are total $1000$ students in college.

$\Rightarrow$ So, out of 100 students $20\%$ students are seniors.

$\Rightarrow$ Number of senior student = $1000\times \frac{20}{100}=200$

$\Rightarrow$ Number of seniors taking Math class = $200\times \frac{40}{100}=80$

$\Rightarrow$ Percentage of students in college are seniors enrolled in math class = $\frac{80}{1000}\times 100=8\%$