It is: 10/30 = 1/3 by dividing both numbers by their highest common factor which is 10
9/30 = 3/10 in its lowest terms
21/30 = 7/10 in its lowest terms
10
3/10
30/100 = 3/10
21/10
3/10
1/10
It is already in lowest terms.
30 over 35 in the lowest terms = 6/7
ANSWER: 21 days : 30 days = 7:10
27/30 can be divided by 3/3 which reduces it to 9/10.