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Mathematics
Mathematics
Problem
In
△
D
E
F
\triangle DEF
△
D
E
F
,
D
E
=
D
F
DE = DF
D
E
=
D
F
. If
∠
E
=
4
y
−
10
∘
\angle E = 4y - 10^{\circ}
∠
E
=
4
y
−
1
0
∘
and
∠
F
=
2
y
+
20
∘
\angle F = 2y + 20^{\circ}
∠
F
=
2
y
+
2
0
∘
, find the value of
y
y
y
.
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