Question

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

Answer 1

The answer to your question is There were 59/168 muffins left.

Explanation:

Data

Initial amount of muffins = 1

Amount of muffins given to his neighbors = 11/21

Amount of muffins eaten = 1/8

Amount of muffins left = ?

Process

1.- Subtract the amount of muffins given to the neighbors and the amount of muffins eaten to the initial amount of muffins.

1 - 11/21 - 1/8 =

-Look for the greatest common factor

21 8 2

21 4 2

21 2 2

21 1 3

7 7

1

GCF = 2 x 2 x 2 x 3 x 7

= 168

-Solve the arithmetical operation

1 - 11/21 - 1/8 = (168 - 88 - 21) / 168

= 59/168

-Conclusion

There were 59/168 muffins left.