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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade X - Proportion
Question
1
1.
If
'b'
is the mean proportional between
'a'
and
'c'
,
then the mean proportional between
(
a
2
+
b
2
)
and
(
b
2
+
c
2
) is
b (a + c)
a (b + c)
ab + bc + ca
c (a + b)
Question
2
2.
What
must be subtracted from
47
,
27
,
39
,
23
so that the resulting numbers
are in proportion ?
8
6
10
7
4
Question
3
3.
Invertendo
of
f
:
q
::
j
:
n
q
:
f
::
n
:
j
f
−
q
:
q
::
j
−
n
:
n
f
:
j
::
q
:
n
f
+
q
:
f
−
q
::
j
+
n
:
j
−
n
f
+
q
:
q
::
j
+
n
:
n
Question
4
4.
Find the product of means of
14
:
15
and
18
:
13
273
270
267
269
182
Question
5
5.
Solve
√
(
x
−
2
)
+
√
(
x
+
3
)
√
(
x
−
2
)
−
√
(
x
+
3
)
=
7
3
(
-27
7
)
(
-83
21
)
(
-89
23
)
(
-77
19
)
(
-85
21
)
Question
6
6.
If
(
a
3
+
3
a
)
(
3
a
2
+
1
)
=
152
98
, find
a
2
5
4
6
3
Question
7
7.
If
(
4
x
2
−
4
x
y
+
y
2
)
=
0
, find
x : y
1 : 2
or
1 : 2
1 : 2
or
0 : 2
2 : 2
or
1 : 2
0 : 2
or
1 : 2
1 : 2
or
1 : 4
Question
8
8.
Find the product of means of
16
17
:
4
13
and
13
8
:
17
15
1
(
-1
2
)
1
2
3
2
16
15
Question
9
9.
If
a
b
+
c
=
b
c
+
a
=
c
a
+
b
where
a
+
b
+
c
=
0,
then each of the ratios is equal to
2
a + b + c
(
-1
2
)
1
2
-1
Question
10
10.
Alternendo of
20
8
=
260
104
12
8
=
156
104
20
260
=
8
104
28
12
=
364
156
28
8
=
364
104
8
20
=
104
260
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