If 3 crows eat 30 worms in one hour, how many worms will 5 crows eat in 2 hours?
If 3 crows eat 30 worms in one hour, then each crow eats 30/3=
<gadget id="calculator">30/3</gadget>
<output>10</output>
10 worms per hour.
5 crows will eat 5*10=
<gadget id="calculator">5*10</gadget>
<output>50</output>
50 worms per hour.
Over two hours, 5 crows will eat 2*50=100 worms.

<result>100</result>