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Standard VI
Mathematics
Ratio
Question
Find
a
:
c
when
(
1
)
a
:
b
=
2
:
5
and
b
:
c
=
4
:
7
(
2
)
a
:
b
=
1
1
2
:
1
2
3
and
b
:
c
=
1
2
3
:
5
.
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Solution
Verified by Toppr
Given:
(1)
a
b
=
2
5
,
b
c
=
4
7
a
c
=
a
b
×
b
c
=
2
5
×
4
7
=
8
35
a
:
c
=
8
:
35
(2)
a
b
=
1
1
2
1
2
3
,
b
c
=
1
2
3
5
a
b
=
3
2
5
3
,
b
c
=
5
3
5
a
b
=
9
10
,
b
c
=
1
3
a
c
=
a
b
×
b
c
=
9
10
×
1
3
=
3
10
a
:
c
=
3
:
10
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3
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:
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:
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