Wheel and belt tractors each day plow 8 ha of fields. For plow 76 hectares, the wheel would have to work for 12 days and 8 days with the belt tractor together. How many hectares do each day of each tractor?

Correct answer:

a =  3
b =  5

Step-by-step explanation:

76 = 12a + 8b
8 = a+b

76 = 12•a + 8•b
8 = a+b

12a+8b = 76
a+b = 8

a = 3
b = 5

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