Answer:
7 : 6
Step-by-step explanation:
The factors of 21 are: 1, 3, 7, 21
The factors of 18 are: 1, 2, 3, 6, 9, 18
The common factors are 1 and 3.
We need to find the greatest common factor.
The larger number between 1 and 3 is 3.
Therefore, the greatest common factor is 3.
Ratios must be written in simplified form.
So, divide 21 and 18 by 3.
21 ÷ 3 = 7
18 ÷ 3 = 6
Therefore, the simplified ratio is 7 : 6.
Take note of the number placement.
Since the original ratio is 21 : 18, we must also write the simplified ratio in that order. So, the simplified ratio is 7 : 6.
