Step-by-step reasoning process: The sum is 9 + 14 + 13 = 36. There are 3 bouquets. The average is 36 / 3 = 12.
The question and answer:
Question and answer: Trevor buys several bouquets of carnations. The first included 9 carnations; the second included 14 carnations; the third included 13 carnations. What is the average number of carnations in the bouquets?
The answer is 12

Step-by-step reasoning process: Anya has 4 x 4 = 16 erasers. Thus, Anya has 16 - 4 = 12 more erasers than Andrea.
The question and answer:
Question and answer: Anya has 4 times as many erasers as Andrea. If Andrea has 4 erasers, how many more erasers does Anya have than Andrea?
The answer is 12

Step-by-step reasoning process: You first need to know the total weight of the vegetables, so you add each quantity: 15 + 13 + 8 = 36 kg. Then you have to find half of 36: 36 / 2 = 18 kg. So, he sold 18 kg of vegetables.
The question and answer:
Question and answer:
A fruit and vegetable merchant installed 15 kg of carrots, 13 kg of zucchini and 8 kg of broccoli. He sold only half of them. What mass of vegetables did he sell?
The answer is 18