21
You can simplify 7/21 by dividing both sides by 7 to get 1/3
21 : 6factor out a 33(7 : 2)7 : 2==========simplified ratio
12/21 = 4/7 in its simplest form
21 and 35 are both divisible by 7 21/35 = 3/5
21
18/21 = 6/7
21/7 = 3 Or, a 3 to 1 ratio.
21:6::7:2
3/7
4/7
3/7
6/21 = 2/7 simplified
You can simplify 7/21 by dividing both sides by 7 to get 1/3
21 : 6factor out a 33(7 : 2)7 : 2==========simplified ratio
4/7
12/21 = 4/7 in its simplest form