With the energy provided by one liter of honey, a bee can fly 7000 kilometers. How many bees could fly one kilometer each, with the energy provided by 10 liters of honey?
(a) 7000
(b) 70000
(c) 700000
(d) 7000000
(e) 70000000
The correct option is (b).

The energy spent by a bee to fly 7000 kilometers is the same as 7000 bees spend to fly 1 kilometer each. Since the number of liters of honey was multiplied by 10, we have enough energy for 10 times that number of bees to fly 1 kilometer each, that is, 70000 bees.