If 1/2 of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after 1 strokes ?  Choose the correct option.
A) 1/2  B) 7/8  C) 1/4  D) 1/8  E) 1/16
Left 1/2fter 1st stroke = 1/2   So removed = 1- 1/2 = 1/2
<result>A</result>
If 1/2 of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after 1 strokes ?