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 result:

x =  297 ha

Solution:


7t • 4 = 308
9t•3 = x

7•t • 4 = 308
9•t•3 = x

28t = 308
27t-x = 0

t = 11
x = 297

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