Please help, I don’t know how to solve this problem :( it’s

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

I'll give brainliest if you answer right : )

Cameron indoor stadium at duke university is one of the most revered sites in all of college basketball, as well as in all of sports period. duke’s men’s and women’s basketball programs have attained quite a few wins in the building over the last seventy years. cameron indoor stadium is capable of seating 9,460 people. for each game, the amount of money that the duke blue devils’ athletic program brings in as revenue is a function of the number of people in attendance. if each ticket costs $45.50, find the domain and range of this function.