Question

..9. 60% students failed in an examination.
If 400 students passed, then find the
total number of students.​

Answer 1

$\large \sf \underbrace{ \underline{Understanding \: the \: question}}$

It is given that 60% students failed in exam so it is obvious that 40% students are passed and the number of students passed are 400.So we can simplify find the Total number of students by making an equation.

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Let us consider the total number of students be X.

So according to the question:

★ 40% of x=400

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Now we can simplify solve this equation to find total number of students :D

$\bf \large40\% \: of \: x = 400$

$\bf \large : \implies \: \: \frac{40}{100} \times \: x = 400$

$\bf \large : \implies \: \: \: x = 400 \times \frac{100}{40}$

$\bf \large : \implies \: \: \: x = \cancel{ 400 \times \frac{100}{40}}$

$\bf \large : \implies \: \: \: x =1000$

•°• Total number of students are 1000.

$\Large \sf \large { \underbrace{ \underline{Points \: to \: remember }}}$

• When % sign is removed we have to add 1/100 in denominator.
• “Of” in an equation means multiply.