1 x 15, 3 x 5, 5 x 3, 15 x 1.
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The common number is 3. 3 times 3 equals 9 3 times 5 equals 15
2/5 plus 1/15 equals 6/15+1/15 equals 7/15.
The French count today as day 1. 1 plus 14 equals 15.
Each of these factor pairs (multiply the numbers in parentheses) equals 225: (1, 225) (3, 75) (5, 45) (9, 25) (15, 15)
120. 120/8 equals 15 and 120/5 equals 24.