Jeff's Auto sold a record number of tires last month. One salesman sold 135 tires which was 60% of the tires sold in the month. What was the record number of tires sold?

What is the range of this function? all real numbers such that y ≤ 40 all real numbers such that y ≥ 0 all real numbers such that 0 ≤ y ≤ 40 all real numbers such that 37.75 ≤ y ≤ 40

How to do this , and can some one explain

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.