In sea water there is 5% of salt. how much seawater do you need in order to get 17.25 lb of salt?

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

The anwser cause i do not understand just plez

Ahighway between points a and b has been closed for repairs. an alternative route between there two locations is to travel between a and c and then from c to b what is the value of y and what is the total distance from a to c to b?