Lucknow bound Shatabdi Express has a capacity of 500 seats of which 10 are in the Executive cl...........

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Lucknow bound Shatabdi Express has a capacity of 500 seats of which 10% are in the Executive class and the rest chair cars. During one journey, the train was booked to 85% of its capacity. If Executive class was booked to 96% of its capacity, then how many chair car seats were empty during that journey?

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Explanation:

Total seats = 500
seats in executive class E = 10% of 500 = 50
seats in chairs class C = 500 - 50 = 450

Total number of Booked seats in train = 85% = 85*500/100 = 425 = B
this includes booked seats in both classes.
number of executive class seats booked = 96% = 96/100 * E = 96* 50/100 = 48
So number of chairs booked = B - 48 = 425 - 48 = 377
So number of chairs empty = C - 377 = 450 - 377 = 73