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The quotient of dividing 249 by 21 is 11, with a remainder of 18. Therefore, 21 can go into 249 11 times with a remainder of 18.
18/21 x 15 is 12 6/7
18 x 35 = 630 630 / 30 = 21 So the answer is 21.
39 ÷ 21 = 1 with remainder 18 or 1.8571 times.
Once, with three left over.