A jar contains black and white marbles. If there are ten marbles in the jar, all of the following could be the ratio of black and whit marbles EXCEPT:

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The average of 7 consecutive numbers is 20. The largest of these number is ---

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A, B and C enter into a partnership. A contributes one-third of the capital while B contributes as much as A and C together contribute. If the profit at the end of the year amounts to Tk. 900, What would C receive?

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In a kilometre race, A beats B by 100 m and B beats C by 150 m. In the same race, by how many metres does A beat C?

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A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is --

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2% of 2=?

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