On Monday, a person mailed 8 packages…

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Last Updated on May 5, 2023

GMAT OFFICIAL GUIDE PS

Solution:

To solve this question we can use the weighted average equation.

Weighted Average = (Sum of Weighted Terms) / (Total Number of Items)

We’ll first determine the sum (numerator). We see that on the first day we had 8 items that averaged 12 3/8 pounds. We don’t know the weights of the individual packages, but we can determine that the sum of all 8 packages is:

Sum of first day’s packages = 8 x 12 3/8 = 99 pounds

Similarly, the sum of the second day’s packages is:

Sum of second day’s packages = 4 x 15 ¼ = 61

We now can use the weighted average equation to find the average weight of the 12 packages:

Weighted Average = (99 + 61) / 12

Weighted Average = 160 /12

Weighted Average = 13 1/3

Answer: A

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