Marc spent 1/4 of his monthly budget on food and 3/5 of his monthly budget on gasoline he spent a total of 272$ on food and gasoline what was his monthly budget

If you make 1/4 and 3/5 have like denominators you get 5/20 and 12/20

then you add the together to get 17/20 and take the total amount payed in total and divide it by the numerator 17 and you get 16 so each 1/20 is $16 then you multiply 16 by 20 to get his monthly budget of $320