-6 is an integer, but not a whole number.
The next 5 terms are 165, 200, 235, 270, 305
5)x= 67° and y= 32°
(x-15)°=52°(vertically opposite angles)
=>x= 52+15° = 67°
Similarly, 4y= 128°(vertically opposite angles)
=>y=128/4= 32°
6) x= 5° , y= 22°
12x+15=75°(vertically opposite angles)
12x=75-15°
12x=60°
x= 5°
6y-27°=105°
6y= 105+27°
6y= 132°
y= 22°
1/3 of an hour = 20 minutes
8 hours = 480 minutes
So to find the number of periods we divide 480 by 20. Answer is 24