The answer will depend on the units for 240, which are not specified in the question.
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15 x 6 = 9040 x 6 = 240
About 13.54 acres.
One acre is equal to 43560 square feet. Therefore, 10 acres is equal to 43560 x 10 = 435600 square feet.
There are 640 acres in one square mile. Therefore, 250 square miles is equal to 250 x 640 = 160000 acres.
There are 640 acres in one square mile. Therefore, 81 square miles is equal to 81 x 640 = 51840 acres.