Tina has a large collection of pets. 1/3 of them are cats, 1/4 of them are dogs, 1/5 are hamsters and the rest are goldfish. If Tina has 39 goldfish, how many pets in total does she have?
Answer
She has 180 pets in total.
Cats + Dogs + Hamsters = 1/3 + 1/4 + 1/5 = 47/60.
Remainder = 13/60 = Number of Goldfish.
If 13/60 = 39, total number of animals = (39×60)/13 = 180.
In other words, 13/60 of Tina’s pets are goldfish and because she has 39 goldfish, 39/13 = 3, so 1/60 = 3, 3×60 = 180, so 180 pets in total and the equation will look like, 20/60 + 15/60 + 12/60 + 13/60 = 60/60, or 1.
