###Human: Happy Island has 60 turtles. This means there are 10 more than 2 times as many turtles on Happy Island as on Lonely Island. How many turtles are there on Lonely Island?, ### Assistant: After subtracting 10 from the number of turtles on Happy Island, we get 60 - 10 = 50 turtles
Dividing this number by two, we find that the number of turtles on Lonely Island is 50/2=25 turtles. 
 So the answer is :  25