If 3 crows eat 30 worms in one hour, how many worms will 5 crows eat in 2 hours? Let's be accurate as possible.
If 3 crows eat 30 worms in one hour, then each crow eats 30 / 3 = 10 worms per hour. 5 crows will eat 5 * 10 = 50 worms per hour. Over two hours, 5 crows will eat 2 * 50 = 100 worms.
The answer: 100.