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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
=
3
x
+
5
∘
\angle E = 3x + 5^{\circ}
∠
E
=
3
x
+
5
∘
and
∠
F
=
2
x
+
25
∘
\angle F = 2x + 25^{\circ}
∠
F
=
2
x
+
2
5
∘
, determine the value of
x
x
x
. a) 25 b) 20 c) 30 d) 12
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