human
There are twice as many surfers on Malibu beach as in Santa Monica beach. If there are 20 surfers in Santa Monica, calculate the total number of surfers on the two beaches.
assistant
How many surfers are there at Malibu beach? ** If there are 20 surfers at Santa Monica, Malibu beach has twice as many surfers as Santa Monica has 2*20 = 40 surfers.
How many surfers are there on the two beaches? ** Together, the two beaches have a total of 40+20 = <<40+20=60>>60 surfers.
#### 60