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100kg: 80 people =1,25kg eaten by each person in total
1,25kg :20 days=0,0625kg eaten a day by 1 person
15kg : 40 people=0,375kg will be eaten by each person
0,375kg : x days =0,0625kg
0,375=0,0625 * x /:0,0625
The answer is six days.
1 5 1
it is in compound variation
no of people    no of kg of rice       no of days
    80                       100                         20
    40                        15                           x
no of people and no of days are in inverse variation
no of kg and no of days are in direct variation
answer = 6 days
1 5 1
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