Remaining 23651

Food for 42 dogs is enough for 35 days. After 15 days, the two dogs adopted new owners. For how many days will the food for the remaining dogs be enough?

Correct answer:

x =  21

Step-by-step explanation:

42·35 = 15·42 + x·(42-2)

40x = 840

x = 840/40 = 21

x = 21

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