Sergio had 6+14= 20 hours of free time in total, 6 of which were spent studying. So, he spent 6/20 hours studying, which is equivalent to 30%
Raul had 8+14= 22 hours of free time in total, 8 of which were spent studying. So, he spent 8/22 hours studying, which is equivalent to 36.363636% (36.4%)
Paulo had 8+2= 10 hours of free time in total, 8 of which were spent studying. So, he spent 8/10 hours studying, which is equivalent to 80%
In order of the lowest to the highest, the percentage of free time spent studying by each boy is:
1) Sergio
2) Raul
3) Paulo