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primary 5 maths questions

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  • 's Avatar
    11 posts since Aug '08
    • can a help a lost soul on this 2 questions? thanks!

       

      1. ken is half as old as terry now. in 15yrs time, ken will be 5/7 as old as terry. how old is ken now?

       

      2.transport company is paid to deliver 300 vases. it charges $25 for every vase delivered safely but pay $60 for every broken vase. the man paid $7245 in total. how many vases were delivered safely.

       

      3.numer of apples in a basket is 180 more than 1/4 of total number of fruits. number of oranges is 100 more than 2/5  of total number of fruits. how many oranges are there if the basket only have apples and oranges.

       

      thanks in advance!

  • skythewood's Avatar
    4,383 posts since Jul '07
    • draw a diagram

      X = a box, Y is another box, mark 15 years

      ken  = X

      terry = X X

      15 years later...

      ken =     X Y

      terry = X X Y

      hence, X is 2/7 of terry's age. ==> Y is 3/7 of terry's age

                                                        ==> 15 years is 3/7 of terry's age

                                                       ==> 35 years is terry's current age

      go figure out ken's age

       

  • skythewood's Avatar
    4,383 posts since Jul '07
    • Originally posted by :

      can a help a lost soul on this 2 questions? thanks!

       

      1. ken is half as old as terry now. in 15yrs time, ken will be 5/7 as old as terry. how old is ken now?

       

      2.transport company is paid to deliver 300 vases. it charges $25 for every vase delivered safely but pay $60 for every broken vase. the man paid $7245 in total. how many vases were delivered safely.

       

      3.numer of apples in a basket is 180 more than 1/4 of total number of fruits. number of oranges is 100 more than 2/5  of total number of fruits. how many oranges are there if the basket only have apples and oranges.

       

      thanks in advance!

      if all safely delivered, 300 x $25 = $7500

      difference between all delivered and amount paid = $7500 - $7245

                                                                                            = $255

      amount loss by truck if one vase is broken = $25(uncollected pay) + $60(damages)

                                                                              = $ 85

      amount of vase broken = 255 divide by 85

                                              = 3

  • skythewood's Avatar
    4,383 posts since Jul '07
    • Originally posted by :

      can a help a lost soul on this 2 questions? thanks!

       

      1. ken is half as old as terry now. in 15yrs time, ken will be 5/7 as old as terry. how old is ken now?

       

      2.transport company is paid to deliver 300 vases. it charges $25 for every vase delivered safely but pay $60 for every broken vase. the man paid $7245 in total. how many vases were delivered safely.

       

      3.numer of apples in a basket is 180 more than 1/4 of total number of fruits. number of oranges is 100 more than 2/5  of total number of fruits. how many oranges are there if the basket only have apples and oranges.

       

      thanks in advance!

      diagram, X, Y and Z means box

      total number of fruits  = X X X X
      number of apples       = X + 180

      total number of fruits = Y Y Y Y Y
      number of oranges   = Y Y +100

      combine both into one diagram, 

      total number of fruits = Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z      ====> 20 Z
      number of apples      = Z Z Z Z Z +180                                                ====> 5 Z +180
      number of oranges   = Z Z Z Z Z Z Z Z  +100                                      ====> 8 Z +100

      total number of fruits = apples + oranges

      20 Z         =        5Z +180        +    8Z +100
      7 Z          =     280fruits
      1 Z          =     40 fruits

      than can calculate oranges

  • 's Avatar
    11 posts since Aug '08
  • seotiblizzard's Avatar
    25,432 posts since Apr '06
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