1 batch of muffins = 2 1/2 cups of flour
3 1/2 batch of muffins = ? cups of flour
Multiply 3 1/2 by 2 1/2.
Change them into improper fractions.
3 1/2 = 7/2
2 1/2 = 5/2
Now multiply.
7/2 x 5/2 = 35/4
35/4 is the same as 8 3/4 or 8.75.
Kento would need 8 3/4 cups of flour to make 3 1/2 batches of muffins.