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Finding Increase or Decrease Percentage in Situations

Question

In the X class, last year there were $300$ students. This year the number decreased by $40$ %. How many students are there in X grade class?
$200$
$180$
$120$
None

A

180

B

None

C

200

D

120

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Solution

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Let $x$ students in this year $\frac{300 - x}{300} = \frac{40}{100}$
$300 - x = 120$ , $x = 180$

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