A bag contains 50 cents, 20 cents and 10 cents coins in the ratio 5:3:1. If the total amount in the bag is $640, find the total number of coins in the bag.
A. 3600
B. 1800
C. 900
D. 2700
E. 4500

• 50*5 + 20*3 + 10*1 = 250 + 60 + 10 = 320
  640$ = 640*100 = 64000 cents.
  64000/320 = 200
  Total Coins = 200*5 + 200*3 + 200*1 = 1800 (B)
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