If a and b are odd numbers, then which of the following is even?

Created: 4 months ago | Updated: 2 months ago
Job Solution Probashi Kallyan Bank Probashi Kallyan Bank - Executive Officer (Cash) - 14.02.2014 গণিত
276
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On selling 17 balls at Tk. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is ----

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Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opended together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?

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