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21 : 6factor out a 33(7 : 2)7 : 2==========simplified ratio
The ratio of 63 and 6 can be simplified by dividing both numbers by their greatest common divisor, which is 3. Dividing, we get 63 ÷ 3 = 21 and 6 ÷ 3 = 2. Therefore, the simplified ratio of 63 to 6 is 21:2.
Since 21 and 18 have the common factor of 3, reduce 'em to get: 21 to 18 = (3 * 7) to (3 * 6) = 7 to 6
If you mean 21/18 then the equivalent ratio is 7/6
It is 21/1 or 21:1