Question

an employee at the craft store counted the number of red buttons in each bag of mixed buttons.
red buttons per bag
how many bags of buttons are there in all?
bags

Explanation:

Step1: Identify counts per category

1 - 20: 15, 21 - 40: 35, 41 - 60: 4, 61 - 80: 24, 81 - 100: 9, 101 - 120: 3, 121 - 140: 14.

Step2: Sum all counts

$15 + 35 + 4 + 24 + 9 + 3 + 14 = 104$.

Answer:

104