Katy had two dogs. The first one ate a pack of granules a week and the other two times longer. Katka bought them two bags of granules. How long does it last for both dogs?

Correct answer:

x =  9.3333 d

Step-by-step explanation:

 x (1/7+1/14)=2  3x=28  x=2839.333333=9.3333 d

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