If a tickets were sold with an activity pass, Cynthia's revenue was

a*1.25 + (348 - a)*3.00 = 613.50

-1.75a + 1044.00 = 613.50 (use the distributive property, collect terms)

-1.75a = -430.50 (subtract 1044)

a = 246 (divide by -1.75)

a*1.25 + (348 - a)*3.00 = 613.50

-1.75a + 1044.00 = 613.50 (use the distributive property, collect terms)

-1.75a = -430.50 (subtract 1044)

a = 246 (divide by -1.75)