Your balance is $42. You buy lunch every day for $1.80 and sometimes buy a snack for $0.85. After 20 days you have a balance of $0.05. How much snacks did you buy?

Answer:The answer to your question is: I bought 7 snacksStep-by-step explanation:Databeginning balance = $42 = blunch = $1.80  = lsnack = $ 0.85  = sfinal balance = $0.05 = f                        f = b - 1.8l - 0.05s                     0.05 = 42 - 1.8l - 0.85sAfter 20 days I spent = 1.8(20) in lunches = $36                    0.05 = 42 - 36 - 0.85s                   0.05 = 6 - 0.85s                  0.05 - 6 = -0.85s                  -5.95 = -0.85s                  s = -5.95/-0.85                  s = 7