Question

Everytime Tish goes to a coffee shop she either buys a soy latte or an iced coffee. In one month she spent a total of $79.10. If the money she spent on soy lattes is $3.50 plus three times the money she spent on iced coffees, how much money did she spend on each drink?

Answer 1

s + c = 79.10
s = 3.50 + 3c

3.50 + 3c + c = 79.10
3c + c = 79.10 - 3.50
4c = 75.60
c = 75.60/4
c = 18.90 <==== amount spent on coffee

s = 3.50 + 3(18.90)
s = 3.50 + 56.70
s = 60.20 <=== amount spent on soy lattes