A room contains 200 people, 25% of whom are graduates. A group of people, 30% of whom are graduates, leave the room. Of the remaining people, 10% are graduates. How many people did leave the room?

150

145

125

120

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উত্তর: 150

Let the number of people leaving be L. Remaining people = 200 - L Total graduates = 25% of 200 = 50 Leaving graduates = 30% of L = 0.3L Remaining graduates = 50 - 0.3L ATQ, 10% of (200 - L) = 50 - 0.3L or, 20 - 0.1L = 50 - 0.3L or, 0.3L - 0.1L = 50 - 20 or, 0.2L = 30 or, L = 30 / 0.2 = 150

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A room contains 200 people, 25% of whom are graduates. A group of people, 30% of whom are graduates, leave the room. Of the remaining people, 10% are graduates. How many people did leave the room?

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If u> t, r> q , s>t, t>r, which of the following must be true?

The price of a certain television set is discounted by 10 percent, and the reduced price is then discounted by 10 percent. The series of successive discount is equivalent to a single discount of -

A pen was sold at 15% loss. If the selling price was Tk. 8 more, than the seller could have made a profit of 10%. What was the purchase price of pen?

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