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03 Dec 2015, 06:33
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
87% (00:57) correct
13%
(01:33)
wrong
based on 87
sessions
History
Date
Time
Result
Not Attempted Yet
In the figure above, the value of b is
A. 20
B. 40
C. 42
D. 80
E. 100
Attachment:
436.jpg [ 11.38 KiB | Viewed 2755 times ]
Updated on: 03 Dec 2015, 06:54
Originally posted by CounterSniper on 03 Dec 2015, 06:39.
Last edited by CounterSniper on 03 Dec 2015, 06:54, edited 1 time in total.
Last edited by CounterSniper on 03 Dec 2015, 06:54, edited 1 time in total.
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4a=b+40 (vertically opposite) --1
5a+b+40=180 (sum =180) --2
from 1 b =4a-40
substituting it in eq 2
5a +4a-40+40=180
a=20
therefore b=40
5a+b+40=180 (sum =180) --2
from 1 b =4a-40
substituting it in eq 2
5a +4a-40+40=180
a=20
therefore b=40
devvratk
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03 Dec 2015, 06:49
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4a+5a = 180 (Angle on same line )
9a=180
a=20
Now b+40=4a=4*20=80(vertically opp angle)
b=40
9a=180
a=20
Now b+40=4a=4*20=80(vertically opp angle)
b=40
