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

Somone me i want to know what 18 hours out of 24 hours in a fraction

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?