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?
There are 60/5=<<60/5=12>>12 5-minute intervals in 1 hour.
12*4=<<12*4=48>>48 snowflakes fell in 1 hour.
There were 58-48=<<58-48=10>>10 snowflakes at first.
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