Question:
In three days Tina sold 15 boxes. On the second day, she sold 1 more than on the first. On the third day, she sold 5 more than on the first. How many boxes did she sell on the third day?
Answer:
8. Tina sold eight boxes on the third day.
Explanation:
Three days, 15 boxes.
On the first day, Tina sold 3 boxes.
On the second, she sold one more than on the first. (4)
On the third day, she sold five more than on the first. (8)
3 + 4 = 7
7 + 8 = 15
So your answer would be:
Tina sold eight boxes on the third day.