⇒x×(1−51​)×(1−21​)×(1−103​)=4200 ⇒ x = 15000 It is given that 25% of total passengers opt to travel by foot So, total passengers opt to travel by foot = 25% of 15000 ⇒ 3750 people. ∴ The number of passengers who opt to travel by foot is 3750 people.