In an office, 5 cabins have got AC, 7 cabins have got fans. If 2 cabins have both AC and fan. What is the number of cabins in the office?
12
14
10
8
Number of cabins = 5+7-2 = 10
Why do aeroplanes have pressurised cabins for the passengers?
Why do aircrafts flying at high altitude must have pressurize cabins