匿名
匿名 發問於 科學及數學數學 · 1 十年前

math thank you~~~

Formulating Problems with Algebraic Language

1) The weight of an empty box and a book are 2kg and 3kg respectively. If the total

weight of books and a box does not exceed 60kg, find the maximum number of books

inside the box.

2)Shui Wsh is the tutor of Chi Keung. The tutorial fee is $120 per hour. Each time, Shui

Wah has $10 travel allowance. Chi Keung has 4 tutorial lessons in July. The total

tutorial fee is $880. How many hours does Chi Keung have?

2 個解答

評分
  • Roger
    Lv 5
    1 十年前
    最愛解答

    {The answer of senya in part 2 is incorrect}

    (1) Let the no. of books be x,

    2 + 3x <= 60 {<= less or equal to}

    x <= 19.3

    As the no. of books should be a whole no.

    Maximum no. of books = 19

    (2) Let x be the no. of hours

    4(10) + 120x = 880

    120x = 840

    x = 7

    Chi Keung has 7 hours of tutorial lessons

  • 志仁
    Lv 6
    1 十年前

    1) Let there are x books

    2+3x<60

    3x<58

    x<19.333

    x=19

    2) Let there be x hours

    10(4) + 120x = 880

    120x=840

    x=6 hrs

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