Which of the following statements contain a variable
Half the height of the building
there are 12 inches in a foot
She arrived at 2 o’clock
The length of the rope

How to solve it and what thw answer is

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

At the county fair, the baxter family bought 6 hot dogs and 4 juice drinks for $12.90. the farley family bought 3 hot dogs and 4 juice drinks for $8.55. find the price of a hot dog and the price of a juice drink.