Question

if 85% of students are passed and 5 students are failed so how many students are there in class​

Answer 1

Answer:

Let total no. of students be x

$Percentage \ of \ students \ passed = 85$ %

$No. \ of \ students \ passed = Total \ no. \ of \ students \times \frac{85}{100}\\\\No. \ of \ students \ passed =x \times \frac{5(17)}{5(20)}\\\\No. \ of \ students \ passed =\frac{17x}{20}\\\\\\No. \ of \ students \ failed = 5$$Total \ no. \ of \ students = No. \ of \ students \ failed + No. \ of \ students \ passed \\\\Total \ no. \ of \ students = \frac{17x}{20} + 5 \\\\x = \frac{17x}{20} + \frac{5(20)}{1(20)}\\\\x = 17x/20 + \frac{100}{20} \\\\x = \frac{17x + 100}{20}\\\\20x = 17x + 20 \\\\20x - 17x = 20 \\\\3x = 20 \\\\x = \frac{20}{3}$

$Thus \ total \ no. \ of \ students \ in \ the \ class = \frac{20}{3}$

Step-by-step explanation: