1/4 + 4/7 + 9/28

To add these fractions, we first need to find a common denominator. The least common multiple of 4, 7, and 28 is 28.

Now, we rewrite each fraction with the common denominator:

1/4 = 7/28

4/7 = 16/28

9/28

Now, add the fractions:

7/28 + 16/28 + 9/28 = 32/28

Simplify the fraction:

32/28 = 8/7

So, the sum of the fractions 1/4, 4/7, and 9/28 is 8/7 or 1 1/7.

17/20 + 23/30 + 11/60

To add these fractions, we need to find a common denominator. The least common multiple of 20, 30, and 60 is 60.

Now, rewrite each fraction with the common denominator:

17/20 = 51/60

23/30 = 46/60

11/60

Add the fractions:

51/60 + 46/60 + 11/60 = 108/60

Simplify the fraction:

108/60 = 9/5

So, the sum of the fractions 17/20, 23/30, and 11/60 is 9/5 or 1 4/5.