Smile asked in 科學及數學數學 · 1 decade ago

2題英文數學題(F.1) 急急急,,入入

識邊題就做邊題啦

1. $3200 is divided among Winnie , Tom and David. If Tom receives three times as much as Winnie, while David receives four times as much as Winnie,how much does Winnie receives ?

2. Bobby saves a fixed amount of money every say. He finds that the price of a model is $70 more than his savings in 5 days or $10 more than his saving in 9 days. How much does he save each day?

2 Answers

Rating
  • 1 decade ago
    Favorite Answer

    1.let Winnie receives money be y

    Tom=3 times Winnie

    Tom=3y

    David=4 times Winnie

    David=4y

    3200= tom + david +winnie

    3200=3y+4y+y

    3200=8y

    y=400

    therefore winnie receives $400

    2. let y be the money he save each day and n be the price of the model

    5y +70=n (1)

    9y +10=n (2)

    sub (1) into (2)

    5y +70 =9y +10

    4y=60

    y=15

    therefore he save $15 each day

    Source(s): 自己
  • 1 decade ago

    let the amount for winnie be x

    Tom : 3x , David : 4x

    3x+4x+x = 3200

    8x = 3200

    x = 400

    ∴winnie receives $ 400

    let the amount he save be x

    5x+70 = 9x+10

    4x = 60

    x= 15

    ∴he saves $ 15 everyday

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