Question

3. The first car of the train, right behind the engine, contains 10 boxes. In each of the following

cars there are twice as many boxes as in the car in front of it.
How many boxes are there in the fifth car?
(A) 100
(B) 120
(C) 140
(D) 160
(E) 180

Answer 1

10×2=20 second car

20×2=40 third car

40×2=80 fourth car

80×2=160 fifth car