Grandfather 3

Grandfather bought a square field of 900 square meters. A beet seedling occupies 20 square centimeters, and a parsley seedling occupies 10 square centimeters. He started by planting beets in rows, and the second row was always parsley. He alternated the rows. How many beet and parsley seedlings did he plant if he always had a 20-centimeter-wide path between the rows of beets and parsley?

Final Answer:

r =  50000
p =  50000

Step-by-step explanation:

$$\begin{gathered} S=900{\text{m}}^2 \\ a=\sqrt{S}=\sqrt{900}=30\text{m} \\ 20c{m}^2=5\cdot 4 \\ 10c{m}^2=5\cdot 2 \\ {r}_2=0.05+0.05+0.20=0.3\text{m} \\ s=0.04+0.02=0.06\text{m} \\ n=a/r_2=30/\frac{3}{10}=30:\frac{3}{10}=30\cdot \frac{10}{3}=\frac{30\cdot 10}{3}=\frac{300}{3}=100 \\ r=n\cdot \frac{a}{s}=100\cdot \frac{30}{\frac{3}{50}}=50000 \end{gathered}$$

$p=n\cdot \frac{a}{s}=100\cdot \frac{30}{\frac{3}{50}}=50000$

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