3/21 = 1:7
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3 : 2
7:3
The ratio of 28 to 21 in simplest form is 4:3. This is obtained by dividing both numbers by their greatest common factor, which is 7 in this case. Therefore, 28 ÷ 7 = 4 and 21 ÷ 7 = 3, resulting in the simplified ratio of 4:3.
It is already in its simplest ratio because 17 is a prime number but if it were 7 boys to 21 girls then the ratio would be 1 to 3
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.