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630, 1260, 1890, 2520, 3150, 3780, 4410 +630 . . .
630 has 24 factors.
630 ÷ 7 = 90
70 x 9 = 630
5 goes into 630 126 times.
630/75 = 8.4
630 divided by 5 equals 126.
It will take 630/A hours.
210
8.75
630
Nine times.