Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
At point
A
A
A
, two adjacent angles are
∠
C
A
B
=
4
x
−
10
∘
\angle CAB = 4x - 10^\circ
∠
C
A
B
=
4
x
−
1
0
∘
and
∠
B
A
D
=
2
x
+
40
∘
\angle BAD = 2x + 40^\circ
∠
B
A
D
=
2
x
+
4
0
∘
. For rays
A
C
AC
A
C
and
A
D
AD
A
D
to lie on the same straight line, the value of
x
x
x
must be: a) 30 b) 25 c) 20 d) 35
Browse the problem library