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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 6=x The answer is six days.

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 =80/40*15/100*20 answer = 6 days