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The average of the first and the second of three numbers is 15 more than the average of the second and the third of these numbers . what is the difference between the first and the third of these three numbers?

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If 18 is 15% of 50% of a certain number, what is the number?

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30 pens and 75 pencils altogether were purchased for Tk. 510. If the speed of the stream is 3 km / hr then find time taken by boat to travel 52 km downstream.

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The ratio of the speed of boat in still water to the speed of stream is 16: 5. A boat goes 16.5 km in 45 minute upstream . Find the time taken by boat to cover the distance of 17.5 km downstream .

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A train passes a platform in 40 sec and a woman standing on the train is 108 km /hr. what is the length of the platform in 25 seconds . The speed of the train is:

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