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the length & breadth of a field 300*400ft, if ther r 3 ants on avg per sq inch of field, find approximate number of ants in field

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a family uses a mixture of a blend of two coffees costing rs.30 and rs.60 respectively . if the family uses only the expensive vareity it will have to spend rs.450 more. the annual consumption of coffee of the family is 20kgs in what ratio the two blends beng used? a 20ltr solution contains oil mand kerosene in the ratio 3:5. if 4lts of themixture is replaced with 4lts of kerosene .what will be the ratio of oil and kerosene?