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=
<gadget id="calculator">60/5</gadget>
<output>12</output>
12 5-minute intervals in 1 hour.
12*4=
<gadget id="calculator">12*4</gadget>
<output>48</output>
48 snowflakes fell in 1 hour.
There were 58-48=
<gadget id="calculator">58-48</gadget>
<output>10</output>
10 snowflakes at first.

<result>10</result>