Answer:
19 bags
Step-by-step explanation:
To solve this problem, we first need to convert 11 1/7 cups to a fraction with a denominator of 7. We can do this by finding a common multiple of 7 and 7 (the denominator of the fraction 1/7) and then multiplying the fractions by the necessary multiples to get them to have a denominator of 7:
11 1/7 cups = (11*7 + 1)/7 cups = 77/7 cups
Next, we need to divide the total amount of snack mix by the amount of snack mix in each bag to find the total number of bags needed:
(77/7 cups) / (3/7 cups/bag) = (77/3)/(7/7 cups/bag) = 11/1 = 11 bags
Finally, we need to round up to the nearest whole number, since we can't have a fraction of a bag. Therefore, Dad will need a total of 19 bags.