15.
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1. The numbers are co-prime.
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.
The average of 330 and 410 is 370.
To find 15 percent of a number, multiply the number by 0.15. In this instance, 0.15 x 330 = 49.5. Therefore, 15 percent of 330 is equal to 49.5.
To find 10 percent of a number, multiply the number by 0.1. In this instance, 0.1 x 330 = 33. Therefore, 10 percent of 330 is equal to 33.