When the diameter of a circle is tripled, the area of the circle will be increased by how many times?

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If 6 persons working 8 hours a day earn a day earn Tk. 8400 per week,then 9 persons working 6 hours a day will earn per week----

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A boat goes 8 km in one hour along the stream and 2 km in one hour against the stream. The speed in km/hr of the stream is ----

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The perimeter of a rectangle is 60 metres. If its length is twice its breadth then its area is --

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A and B stats a business jointly. A invests Tk. 16000 for 8 months and B remains in the business for 4 months. Out of the total profit, B claims 2/7 of the profit. How much money was contributed by B?

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If an article is sold at 200 percent profit, then the ratio of its cost price to selling will be ----

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