A sum of 24 is divided into two parts so that seven times the first part added to five times the second part makes 146. The value of first part is?

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উত্তর: 13

Let the value of first and second part be F and (24 - F) respectively. Now, 7F + 5(24 - F) = 146 or, 7F + 120 - 5F = 146 or, 2F = 146 - 120 or, F = 26/2 = 13

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