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Seeta Devi has Rs 9 in fifty- paise and twenty five-paise coins. She has twice as may twenty- five paise coins as she has fifty- paise coins. How many coins of each kind does she have?

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Let the number of coins of fifty paise are x

Number of coins of twenty five paise are 2x

Amount due to fifty paise coins = \(\frac{50\times x}{100}\)= 0.50x

Amount due to twenty five paise coins = \(\frac{25\times2x}{100}\) = 0.50 x

According to the question total amount = Rs 9

0.50x + 0.50x = 9

x = 9

Therefore the number of coins of fifty paise are 9

Number of coins of twenty five paise are 2x = 2\(\times\)9 = 18

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