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Mathematics
Mathematics
Problem
Rays
O
A
OA
O
A
,
O
C
OC
O
C
and
O
D
OD
O
D
are drawn such that
O
C
OC
O
C
lies between
O
A
OA
O
A
and
O
D
OD
O
D
. If
∠
A
O
C
=
(
2
y
+
20
)
∘
\angle AOC=(2y+20)^{\circ}
∠
A
O
C
=
(
2
y
+
20
)
∘
and
∠
C
O
D
=
(
4
y
−
20
)
∘
\angle COD=(4y-20)^{\circ}
∠
C
O
D
=
(
4
y
−
20
)
∘
, then for which value of
y
y
y
will
O
A
OA
O
A
and
O
D
OD
O
D
form a straight line? a) 20 b) 28 c) 30 d) 60
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