Ten frogs are sitting on a log floating on the surface of a river. Two of them decides to jump off in the water.
How many frogs are there on the log at this moment ?
10. because at that that moment two of them only decided to jump but not actually jump.
There are still 10 frogs on log as 2 of them decided to jump, not yet jumped actually :)
There are 10 frogs in the log. Because the 2 frogs have only decided to jump.
An empty bus pulls up to a stop and 20 people get on. At the next stop 10 people get off and twice as many people get on as at the first stop. At the third stop 50 get off.
How many people are on the bus at this point?