30 subtract 21 1/5 =?

Answer 1

To subtract 21 1/5 from 30, you need to convert both numbers to the same format.

30 can be written as a fraction with a denominator of 5: 30 = 30/1 = 150/5

Now we can subtract them:
150/5 - 21 1/5 = (150-21)/5 - 1/5 = 129/5 - 1/5

Since the denominators are the same, we can subtract the numerators directly while keeping the denominator the same:
129/5 - 1/5 = (129-1)/5 = 128/5

Therefore, 30 - 21 1/5 = 128/5