So, to find how to simplify this, you need to:
1) Find a number that can be divided by BOTH 21 and 28.
2) Divide BOTH 21 and 28 by that number.
Let's do it!
7 is the number that can be divided by BOTH 21 and 28;
21 ÷ 7 = 3
28 ÷ 7 = 4
So, the answer is:
3:4
I hope this helps! If it did, a Brainliest would be really appreciated! <3
Have a great day!
