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Number of 35-paise postal stamps = x
Therefore, Number of 60-paise postal stamps = 147 – x
Therefore, 35x + 60 (147 – x) = 6820
=> 35x + 8820 – 60x = 6820
=> 8820 – 25x = 6820
=> 25x = 8820 – 6820 = 2000
=> x = 2000 ÷ 25 = 80
Answer: 80 35-paise stamps were purchased by him.