On the first day, 1/3 of the entire field area was plowed, on the second day, 2/15 of the entire field area, and on the third day, 68.8 hectares remained. How many hectares of land were plowed in three days?
x – the whole area of the field
From the conditions of the problem:
x-1 / 3x-2 / 15x = 68.8
x * (15-5-2) / 15 = 68.8
x * 8/15 = 68.8
x = (68.8 * 15) / 8 = 129 hectares – plowed area in three days
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