1. The numbers are co-prime.
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Since the numerator and denominator of the fraction are co-prime, the proper fraction 247/330 is already expressed in its simplest form.
15.
This is expressed as 250< n < 330 and covers any number in the range 251 to 329. If 250 and 330 are to be included in the range then the expression is written 250 ≤ n ≤ 330.
Well, darling, the Greatest Common Factor (GCF) of 132 and 330 is 66. You see, it's the largest number that divides both 132 and 330 without leaving a remainder. So, there you have it, sugar, 66 is the magic number in this case.
The average of 330 and 410 is 370.