If there are sixty-five dolphins in the ocean, and three times that number joins in from a river which has its mouth at the ocean, calculate the total number of dolphins in the ocean.
When three times the number of dolphins in the ocean joins in from a river, the number of dolphins in the ocean increases by 3 *65 = <<3*65=195>>195
The total number of dolphins in the ocean increases to 195+65 = <<195+65=260>>260
#### 260