Bunuel wrote:
The graph above shows how long departures from a certain airport were delayed on a certain day. If 1,200 flights were delayed, how many flights departed on time?
A.250
B.300
C.350
D.400
E.900
According to the chart, we see that 43 + 17 + 12 + 3 = 75%, or ¾, of the total flights were delayed. If we let T = the total number of flights, we have:
(3/4)(T) = 1200
3T = 1200 x 4
T = 400 x 4 = 1600.
Since 100 - 75 = 25%,
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