1) The length and breadth of a rectangular container are 40 cm and 25 cm respectively. It is filled with sand and clay in the ratio 2:3 . If the depth of sand in the container is 6 cm, how much more clay than is there?
2) A rectangular container is 3/4(四份三) filled with oil. The lenght, breadth and height of the container are in the ratio 7:5:3. If its length is 20 cm longer than its height, how much more oil can the container contain?
請幫忙列式英數
2010-05-16 5:19 am
回答 (1)
2010-05-16 5:56 am
✔ 最佳答案
1) Let c be the depth of clay 2/3 = 6/c
c = 9
more clay than sand:
(9-6) * 40 * 25
=3000 cm 2
2) let the height be h
h+20/7 = h/3
h = 15
lenght : h +20 = 15 + 20 = 35
Let b be the breadth
b/5 = 15/3
b = 25
It can contain:
35 * 25 * 15 * 1/4
=3281.25 cm 3
收錄日期: 2021-04-23 18:26:15
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