a english math problem
2007-04-15 7:32 pm
a square patch of grass measuring 7 feet by 7 feet uses about 3 ounces of fertilizer. how many ounces of fertilitzer will be needed for a rectangular lawn that is 21 feet by 14 feet?
回答 (2)
2007-04-15 7:59 pm
✔ 最佳答案
Area of 7 feet by 7 feet patch of grass= 7 X 7
= 49 sq. feet
Area of 21 feet by 14 feet patch of grass
= 21 X 14
= 294 sq. feet
Let x ounces of fertilizer is need for the rectangular lawn
x / 3 = 294 / 49
x = 18
So, 18 ounces of fertilitzer will be needed for a rectangular lawn that is 21 feet by 14 feet.
參考: Myself~~~
2007-04-15 11:48 pm
From the question, u get this ratio:
3 ounces of fertilizer
----------------------------
7*7 feet^2 grass
then,
3 ounces of fertilizer X 21*14 feet^2 grass
----------------------------
7*7 feet^2 grass
cancel the same unit and do the arithmetic
the answer is 18 ounces of fertilizers
3 ounces of fertilizer
----------------------------
7*7 feet^2 grass
then,
3 ounces of fertilizer X 21*14 feet^2 grass
----------------------------
7*7 feet^2 grass
cancel the same unit and do the arithmetic
the answer is 18 ounces of fertilizers
參考: me
收錄日期: 2021-04-13 15:40:33
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https://hk.answers.yahoo.com/question/index?qid=20070415000051KK01461