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    There are 495 coins in a bottle.
    1/3 OF THE COINS ARE £1 COINS
    124 of the coins are 50p coins
    The rest of the coins are 20 p

    Work out the total value of the 495 coins
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    Answer is £268.20.

    1/3 of 495 is 165. So 165 coins are £1 coins....So we have £165

    124 coins multiplied by £0.50 is £62

    495-(124+165)=206...so 206 coins are 20p...
    Therefore 206 multiplied by £0.20 is £41.20

    Add them altogether to get total value....
    £165+£62+£41.20=£268.20
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    (Original post by neluxsan)
    Answer is £268.20.

    1/3 of 495 is 165. So 165 coins are £1 coins....So we have £165

    124 coins multiplied by £0.50 is £62

    495-(124+165)=206...so 206 coins are 20p...
    Therefore 206 multiplied by £0.20 is £41.20

    Add them altogether to get total value....
    £165+£62+£41.20=£268.20
    The probability that a new fridge has a fault is 0.015
    What is the probability that a new fridge does not have fault?
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    1-0.015=0.985

    Fault is opposite of not have fault so you just subtract it from 1 as there are only two events possible.

    So answer is 0.985
 
 
 

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