Gadgets Students Use

A group of the eighth-grade students at the school № 843 has done a survey to find out what gadgets the students use to save and show their PowerPoint presentations.
There are 28 students in the class.
The survey showed that more than half the students use flash drives. 7,2 % of students use laptops. Around one out of four use tablets. 14,2 % of students use mobile phones.

Based on the survey, how many students prefer using laptops to show their PowerPoint presentations to the whole class. \(Type the number with letters\.\)