Afarmer has 100 gallons of a solution that is 70% disinfectant. he wishes to mix it with a solution that is 90% disinfectant to make a 75% disinfectant solution. how much of the 90% disinfectant solution must he use?

Item 1 which question could the expression 1000n answer? let n = the number of gallons of gas used. how many miles per gallon did the car get driving 1000 miles? let n = the number of grams of food needed for each dog. how many grams of food are needed to feed 1000 dogs? let n = the number of people at the show. how many empty seats were there at the show if there are 1000 seats at the theater? let n = the number of seats at the theater. how many empty seats will there by if 1000 people come to the show?