ICSE Board Practice

ICSE Grade X - Proportion
Question 1
1.
    • If
    • (
      5
      x
      +
      17
      )
    • ,
    • (
      x
      +
      6
      )
    • ,
    • (
      7
      x
      +
      4
      )
    • and
    • (
      x
      +
      12
      )
    • are in proportion,
    • find
    • x
  • (
    (
    -17

    4
    )
    ,
    21
    )
  • (
    (
    -9

    2
    )
    ,
    19
    )
  • (
    (
    -9

    2
    )
    ,
    20
    )
  • (
    (
    -7

    2
    )
    ,
    20
    )
  • (
    22
    ,
    (
    -5

    2
    )
    )
Question 2
2.
    • If
    •  
    • a

      b
        +  
      c
      =
      b

      c
        +  
      a
      =
      c

      a
        +  
      b
    • where
    • a
        +  
      b
        +  
      c
    • 0,
    • then each of the ratios is equal to
  • 1

    2
  • (
    -1

    2
    )
  • 2
  • a + b + c
  • -1
Question 3
3.
    • Componendo
    • of
    •  
    • 9
      :
      8
      ::
      63
      :
      56
  • 17
    :
    8
    ::
    119
    :
    56
  • 8
    :
    9
    ::
    56
    :
    63
  • 9
    :
    63
    ::
    8
    :
    56
  • 1
    :
    8
    ::
    7
    :
    56
  • 17
    :
    1
    ::
    119
    :
    7
Question 4
4.
    • If
    •  
    • (
      a
      3
       
      +
      48
      a
      )

      (
      12
      a
      2
       
      +
      64
      )
    • =
    • 91

      37
    • , find
    • a
  • 29
  • 28
  • 27
  • 26
  • 30
Question 5
5.
    • If
    •  
    • 'a'
    • 'b'
    • and
    • 'a'
    • :
    • 'b'
    • is the duplicate ratio of (
    • 'a'
    • +
    • 'c'
    • ) : (
    • 'b'
    • +
    • 'c'
    • ),
    • then the mean proportional between
    • 'a'
    • and
    • 'b'
    • is
  • c
  • 2c
  • c
    2
  • c

    2
Question 6
6.
    • Dividendo of
    • 3

      5
      =
      42

      70
  • 8

    2
    =
    112

    28
  • 3

    42
    =
    5

    70
  • 8

    5
    =
    112

    70
  • 5

    3
    =
    70

    42
  • 2

    5
    =
    28

    70
Question 7
7.
    • Find the product of means of
    • 1
      :
      9
    • and
    • 9
      :
      19
  • 81
  • 78
  • 19
  • 84
  • 80
Question 8
8.
    • Dividendo
    • of
    •  
    • n

      r
      =
      a

      k
  • n
      +  
    r

    n
       
    r
    =
    a
      +  
    k

    a
       
    k
  • n

    a
    =
    r

    k
  • r

    n
    =
    k

    a
  • n
      +  
    r

    r
    =
    a
      +  
    k

    k
  • n
       
    r

    r
    =
    a
       
    k

    k
Question 9
9.
    • If
    • a
      :
      b
      ::
      b
      :
      c
    • ,
    • then '
    • c
    • ' is called
  • third proportional
  • first term
  • mean proportional
  • second term
Question 10
10.
    • Find the product of extremes of
    • 4
      :
      15
    • and
    • 10
      :
      8
  • 31
  • 150
  • 29
  • 32
  • 34