Question

of all the people flying on a jumbo jet 23/30 people are seated in the economy class while 1/6 are flying first class .if all the passenger are flying in either economy on first class what fraction of all the people on the plane are the cabin and flight crew.

Answer 1

Jumbo jet => 23/30
Economy class => 1/6
First class => x

First class + economy class + flight crew = Jumbo jet
x + 1/6 = 23/30-x
2x = 23/30 - 5/30
2x = 18/30
x = 9/30 = 3/10

therefore flight crew consists of 3/10 fraction

Answer 2

Fraction of the passengers on economy class = 23/30

Fraction of the passengers on first class = 1/6

Find the total fraction of passengers on economy class and first class:

Total passengers = 23/30 + 1/6 = 14/15

Find the total number crews on the plane:

Crews = 1 - 14/15 = 1/15

Answer: 1/15 of the people on the planes are cabin and flight crews.