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There are coins of denomination Rs. 1, Rs. 2 & Rs. 5. Their total number is 300 and total amount is Rs. 960 .When the number of Rs. 1 &Rs. 2 coins are inter changed the total value is decreased by Rs. 40 .The total number of Rs. 40 . The total number of Rs. 5 coins are ?

A

140

B

145

C

180

D

120

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