Answer:
1:7
Explanation:
We can look at this like simplifying fractions. The fraction would be 4/28, and all we need to do is find the highest number that both the numbers are equally divisible by. In this case, that number is 4. 4/4=1 and 28/4=7 so the new fraction is 1/7. Then we replace the division sign with : to signify a ratio, thus getting 1:7.