131. When x is added to each of 9, 15, 21 and 31 the numbers so obtained are in proportion. What is the mean proportional between the numbers (3x - 2) and (5x + 4)?
132. A bag has Rs. 43 in the form of 5 rupee, 50 paise and 10 paise coins in the ratio of 1 : 5 : 11. What is the total number of 50 paise coins?
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