A drink costs 3 dollars and a sandwich costs 5 dollars. You buy 10 items (some combination of drinks and sandwiches) and you spend 42 dollars.How many of each item did you buy?
Let # drinks = x
then 10 -x is # sandwiches
$ 3 * x + $ 5 * (10-x) = $ 42 solve for 'x' which is the number of drinks ....then # sandwiches = 10 - x