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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade X - Proportion
Question
1
1.
Find the third proportional of 5 and 15
44
46
45
47
43
Question
2
2.
If
12
:
20
::
15
:
x
, find '
x
'
24
23
25
26
27
Question
3
3.
Invertendo
of
4
:
3
::
32
:
24
7
:
3
::
56
:
24
7
:
1
::
56
:
8
4
:
32
::
3
:
24
3
:
4
::
24
:
32
1
:
3
::
8
:
24
Question
4
4.
If
a
b
=
c
d
,
then which of the following is true ?
5
a
+
2
b
5
a
−
2
b
=
5
c
+
2
d
5
c
−
2
d
5
a
+
3
b
5
a
−
3
d
=
5
c
+
2
d
5
c
−
3
d
5
a
−
3
b
5
a
−
3
d
=
5
c
−
2
d
5
c
−
3
d
5
a
+
2
d
5
a
−
2
d
=
2
b
+
5
c
2
b
−
5
c
Question
5
5.
Invertendo
of
5
6
=
35
42
11
6
=
77
42
6
5
=
42
35
1
6
=
7
42
5
35
=
6
42
11
1
=
77
7
Question
6
6.
Solve
√
(
x
−
1
)
+
√
(
x
+
4
)
√
(
x
−
1
)
−
√
(
x
+
4
)
=
4
2
(
-37
8
)
(
-29
6
)
(
-35
8
)
(
-39
8
)
(
-9
2
)
Question
7
7.
If
(
a
3
+
3
a
b
2
)
(
3
a
2
b
+
b
3
)
=
1241
217
, find
a : b
17
:
1
17
:
-1
16
:
1
18
:
1
17
:
4
Question
8
8.
Componendo and dividendo of
6
14
=
18
42
20
8
=
60
24
6
18
=
14
42
8
14
=
24
42
20
14
=
60
42
14
6
=
42
18
Question
9
9.
Invertendo
of
s
g
=
w
f
s
w
=
g
f
s
+
g
g
=
w
+
f
f
s
−
g
g
=
w
−
f
f
g
s
=
f
w
s
+
g
s
−
g
=
w
+
f
w
−
f
Question
10
10.
Find the product of extremes of
6
:
20
and
4
:
10
59
63
60
80
57
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