Hay bags

4 cows eat 16 hay bags in 5 days. How many bags will eat 5 cows in 7 days?

Correct answer:

x =  28

Step-by-step explanation:

$$\begin{gathered} k=16\mathrm{/}5\mathrm{/}4={\displaystyle \frac{4}{5}}=0.8 \\ x=5\cdot 7\cdot k=5\cdot 7\cdot 0.8=28 \end{gathered}$$

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