A carton of drinks cost x cents. Alex buys a number of cartons and they cost y dollars altogether. Express, in terms of x and y, for the number of cartons that Alex buys
If a carton of drinks costs x cents, then the cost of a carton of drinks in dollars is x/100.
If Alex buys n cartons, then the total cost of the cartons in dollars is n * (x/100) = nx/100.
If the total cost of the cartons is y dollars, then nx/100 = y.
Solving for n, we have n = 100y/x.