Mr. Gallegos made a batch of muffins. He gave 11/21 of the batch to his neighbors and ate 1/8 of the batch himself. Which is the best estimation of the fraction of the batch that was left?

The best estimation of the fraction of the batch that was left is 5/84

Step-by-step explanation:

Mr. Gallegos has:

A batch of muffins = 1

He gave 11/21 of the batch to his neighbors:

1 - 11/21 = 21/21 - 11/21 = 10/21

He ate 1/8 of the batch himself:

10/21 - 1/8 = 10/168

= 10/168 (dividing by 2)

= 5/84

The best estimation of the fraction of the batch that was left is 5/84