Multiple choice

In April, Jennifer sold on an average 15 ice creams daily. In the first 20 days of May, she sold on an average 20 ice creams. Which of the following is true regarding the average number of ice creams sold over the whole period?

  1. More than 15

  2. Less than 15

  3. Equal to 10

  4. More than 20

  5. Less than 10
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A Correct answer
Explanation

April has 30 days, May has 31. The average for April is 15. The average for the first 20 days of May is 20. The overall average is (15*30 + 20*20) / (30 + 20) = (450 + 400) / 50 = 850 / 50 = 17. Since 17 > 15, the average is more than 15.

AI explanation

The total number of ice creams sold in April is 15 * 30 = 450, and in the first twenty days of May the total is 20 * 20 = 400. The combined total for the 50 days is 850. The overall average is 850 / 50 = 17, which is more than 15.

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