Page 3, Q 5::
M.F (multiplying factor) = 99>>>>100%-1%
(99*4)รท100= 3.96 hours
3 hours......0.96 hours *60= 57.6 minutes
3 hours, 57 minutes.....0.6 min*60= 36 seconds
3 hours, 57 minutes, 36 seconds
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Page 4, Q 9::
X= 70*2 ==> 140 (degrees)
OSC = 90 (degrees)
so, Y= 90-40 ==> 50 (degrees)
OAC...X+2a=180...........the a is a virtual letter for the angle at OCA which is equal for OAC
a=20 (degrees)
SO, BCA = 40+20 ==> 60
AND, BAC = 180-60-70
BAC= Z+20
SO, Z+20=50
Z=30 (degrees)