###Human: There were some snowflakes at first. It snowed an additional 4 snowflakes every 5 minutes. If there were 58 snowflakes after 1 hour, how many snowflakes were there at first?, ### Assistant: There are 60/5=12 5-minute intervals in 1 hour.
12*4=48 snowflakes fell in 1 hour.
There were 58-48=10 snowflakes at first. 
 So the answer is :  10