Milktea asked in 教育與參考考試 · 2 decades ago

另一題有關頁數的英文數學題-----20點

2.A secretary typed 6 letters, each of which had either 1 or 2 pages.

If the secretary typed 10 pages in all, how many of letters had

two pages?

2 Answers

Rating
  • 2 decades ago
    Favorite Answer

    Let x be the amount of letters which contain 1 page

    Let y be the amount of letters which contain 2 pages

    x + y = 6 -----------A

    1x + 2y = 10---------B

    B-A =======> y= 10- 6= 4

    subsitute y=4 into A

    x + 4 = 6

    x =6-4 = 2

    Answer: There are 4 letters which have 2 pages.

    Source(s): myself
  • Anonymous
    2 decades ago

    因為總共打6封信.所以可以底下計算式算出有幾封信是2頁.

    4*2+2*1=10

    (封數*頁數+封數*頁數=總頁數)

    所以.有4封是2頁.有2封是1頁

    Source(s): me
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