You divide the total cost of the 4 items by 4 to find the cost on 1 item.
Answer is approximately 1.07 lbs, You divide 14 pounds into the 13 bags of popcorn to get the weight of each bag
Let s be the son's age 15 yeasr ago and m the mother's age that year.

We also know that:

Plotting vallues:

Remember that they were that age 15 years ago.
So their actual age is 30 and 60.
Answer:
All of those numbers are rational