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In 2 kg mixture of copper and aluminium, 30% is copper. How much aluminium powder should be added to the mixture so that the proportion of copper becomes 20% ?

1)800 gms.

2)900 gms

3)1000 gms

4)1200 gms


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  • Exam: SOLVED PAPER SSC CHSL 2015 CONDUCTED ON 01 11 2015 IST SHIFT





    Mixture = 2 kg = 2000g.
    Copper = 30% of 2000 = 600g.
    To make copper 20% of mixture, we should need to mix 1000g of Aluminum.
    As,
    2000 + 1000 = 3000g mixture.
    And 20% of 3000 = 600g.

  • : 3

    According to the question,
    Mixture of copper and aluminium = 2000 gm
    30% is copper means =
    = 600 gm copper
    1400 + x = 2400
    x = 1000 gms
    Alternat
    e:
    -
    Copper : Aluminium
    30 : 70
    20 : 80
    Copper : Aluminium
    3 : 7
    → 10 units = 2000 gms
    → 1 unit = 200 gm
    1 : 4 →
    ×3
    We have to equal Copper amount because
    only
    Aluminium is added.
    Copper : Aluminium
    3 : 7
    + 5 units
    3 : 12
    1 unit = 200 gm
    5 unit = 200 × 5 = 1000 gm

  • : 0

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