Let f represent the number of tickets for fathers. The total revenue equation is

2.00*f + 1.50*(75-f) = 127.50

.50*f + 112.50 = 127.50 (use the distributive property, collect terms)

.50*f = 15.00 (subtract 112.50)

f = 30 (multiply by 2)

2.00*f + 1.50*(75-f) = 127.50

.50*f + 112.50 = 127.50 (use the distributive property, collect terms)

.50*f = 15.00 (subtract 112.50)

f = 30 (multiply by 2)

**30 tickets were sold for fathers and 45 tickets were sold for sons**. There is not enough information to tell how many*attended*breakfast.