Mark O. answered 01/16/18
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What fraction f of land is used for mangoes?
1/3 + 1/4 + 3/8 + f = 1
f = 1 - 1/3 - 1/4 - 3/8
f = 24/24 - 8/24 - 6/24 - 9/24, finding a common denominator 24.
f = 1/24
So, 9 hectares represents 1/24 of the land. Therefore, the total land area is (1/24)A = 9, or A = (24)(9) = 216 hectares.