Seven tractors

Seven tractor plowed 308 ha field in four days. How many hectares of fields will plowe 9 tractors in 3 days at the same power?

Correct answer:

x =  297 ha

Step-by-step explanation:


7t · 4 = 308
9t·3 = x

7·t · 4 = 308
9·t·3 = x

28t = 308
27t-x = 0

Row 2 - 27/28 · Row 1 → Row 2
28t = 308
-x = -297


x = -297/-1 = 297
t = 308/28 = 11

t = 11
x = 297

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