<human>:  Ali, Peter, and Joey were fishing. The fish Ali caught weighed, in sum, twice as much as the fish that Peter caught. Joey caught 1 kg more fish than Peter. Together the three of them caught 25 kg of fish. How many kilograms did Ali catch?
<bot>: How many kg of fish did Ali and Joey catch? ** Let x be the weight of the fish that Peter caught. Then Ali and Joey caught 2*x and x+1 kg of fish, respectively.
Write an equation ** So, x+ 2*x + x+1 =25
Simplify ** So, 4*x = 25 - 1 = 24
Simplify ** So, x = <<6=6>>6
How many kg of fish did Ali catch? ** Therefore, Ali caught 2*x = 2*6 = 12 kg of fish
#### 12