A restaurant uses 15 pound bags of flour in four days each day. The bag of flour gets lighter as more flour is used.

Answer 1

At the start of the first day, the restaurant has a full 15-pound bag of flour.

By the end of the first day, some flour has been used, so the bag is lighter. Let's say x pounds of flour have been used on the first day. Therefore, the bag now weighs 15 - x pounds.

On the second day, another 15-pound bag is used, so the total weight of flour used in two days is x + 15 - x = 15 pounds.

At the start of the third day, the second bag is empty, and the restaurant starts a fresh 15-pound bag. Thus, they have 15 pounds of flour available.

On the third day, the remaining flour from the previous day is used, so the bag now weighs 15 - (x + 15 - x) = 15 - 15 = 0 pounds.

Finally, on the fourth day, another 15-pound bag is used, so the total weight of flour used in four days is x + 15 - x + 15 = 30 pounds.

To summarize:
- On the first day, x pounds of flour are used
- On the second day, 15 pounds of flour are used
- On the third day, the remaining flour is used (0 pounds)
- On the fourth day, another 15 pounds of flour are used

Therefore, in four days, the restaurant uses a total of x + 15 + 0 + 15 = x + 30 pounds of flour.