There are 40 coins in a bag, consisting of Rs. 5 and Rs. 2 coins. If the total amount is Rs. 140, how many Rs. 2 and Rs. 5 coins are there in the bag?
A. 20 each
B. 20 and 15 each
C. 30 and 10 each
D. 22 and 18 each
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Let the no.of two rupee coins be x
5(40-x)+2x=140
x=20