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# 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

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- 2 decades agoFavorite 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 - Anonymous2 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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