Answer:
Step-by-step explanation:
There are 24 hours in a day, therefore:
The total hour used for sleeping, studying and travelling=7+6+6=19 hours
Hours used for other things=24-19=5 hours
Therefore, the fraction of the day used for other things=
1/3
1/6+1/6
1+1/6
2/6
Equation: 6x=3x+72
So 3x=72
x=24
$\angle GFH=\angle FBD=\angle ABC=144$