The ratio of boys and girls in a school is to 7. If there are 150 boys and girls, how many boys are there?
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A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

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Running at the same constant rate, 6 identical machines can produce a total of 270bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes?

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If a-b=3 and a2+b2=29, what is the value of ab?

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A starts business with TK. 3500 and after 5 months, B joins with A as his partner. After a year, the profit is divided in the ratio 2:3. What is B's contribution in the capital?

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