Luke is 5 years younger than 3 times sydney’s age, s in this solution, what does 3s represent?

Louise mowed a neighbors yard to earn $25. she mowed a few more yards and earned an additional $75. she continued to mow all of the yards each week for a total of 5 weeks, earning money at the same rate. at the end of the 5 weeks, she spent $250 write a numerical expression with parentheses for the amount of money louise has left. (do not simplify your expression)