At Carl's Diner ,there are 3 sizes of coffee drinks: regular (300 ml), large(500ml) and
extra - large (800ml), and they cost Rs. 5. Rs.8 and Rs.12 respectively. One evening
the diner sold a total of 37 coffees. The total volume of coffee sold was 19,100ml and the
amount of money made in coffee sales was Rs. 300. How many, of each size of drink,
did customers buy that evening? (Using Cramer's rule)
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