<human>:  There are three goldfish and ten platyfish in a fish tank. Each goldfish plays with ten red balls, while each platyfish plays with five white balls. What is the total number of balls in the fish tank?
<bot>: How many red balls are there? ** If there are 3 goldfish, and each is playing with ten red balls, then the number of red balls in the tank is 3*10=<<3*10=30>>30
How many white balls are there? ** There are also ten platyfish playing with 5 white balls, there are 10*5= <<10*5=50>>50 white balls.
How many balls are there? ** The total number of red and white balls in the fish tank is 50+30 = <<50+30=80>>80
#### 80