Answer:
7:5
Step by step Explanation:
The ratio 28:20 can be simplified by dividing both numbers by their greatest common factor. The prime factors of 28 are 2, 2, 7, and the prime factors of 20 are 2, 2, 5. The greatest common factor of 28 and 20 is 4 (two 2's), so dividing both numbers by 4 yields:
28 ÷ 4 = 7
20 ÷ 4 = 5
Therefore, the simplified ratio is 7:5.