How many buses are required to fleet 689 workers?

Question

A company hires a fleet of buses to transport its workforce to a conference. If 689 workers attended the conference, and each bus seats 35 passengers, how many buses are required?

Answer 1

if 19 buses carries 35 passengers each then it carries 665 passengers/workers,then for other 24 passengers it needs another bus,so total buses is 20..