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Question
If
A
:
B
=
3
:
4
,
B
:
C
=
5
:
7
,
find
A
:
B
:
C
Easy
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Solution
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A
:
B
=
3
:
4
Let
A
be
3
k
and
B
be
4
k
.
B
:
C
=
5
:
7
Let
B
be
5
x
and
C
be
7
x
4
k
=
5
x
x
=
5
4
k
A
:
B
:
C
=
3
k
:
4
k
:
7
x
=
3
k
:
4
k
:
7
(
5
4
k
)
=
1
5
k
:
2
0
k
:
2
8
k
=
1
5
:
2
0
:
2
8
Hence
A
:
B
:
C
=
1
5
:
2
0
:
2
8
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