Acquaintances 81901

One liter of oil is enough for mom, dad, and son for 20 days. How many days will pass if 2 acquaintances come to visit?

Correct answer:

x =  12

Step-by-step explanation:

d=(1+1+1) 20=60 d  x=1+1+1+2d=1+1+1+260=12

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