If 20 is increased by B, the result is 120% of B. Find the value of B.
算式是不是：
20+B=120%B ?
如果是，
怎樣計算呢？
請教數學題！！
2007-03-02 1:50 am
回答 (3)
2007-03-02 2:54 am
✔ 最佳答案
If 20 is increased by B, the result is 120% of B. Find the value of B.20+B=120%B
I think your equation set correctly.
20+B=120%B
20=1.2B-B
0.2B=20
B=100
Here is the verification:
20 is increased by B
which means 20+100=120
120% of B
which means 100x120%=120
The result is verified.
2007-03-02 2:55 am
是.
20+B=120%B
20+B=1.2B
20=0.2B
B=100
20+B=120%B
20+B=1.2B
20=0.2B
B=100
2007-03-02 1:53 am
According to the statement, 20 + B = 120% x B
=> 20 + B = 1.2B
=> 20 = 1.2B - B
=> 20 = 0.2B
=> B = 20 / 0.2 = 100
=> 20 + B = 1.2B
=> 20 = 1.2B - B
=> 20 = 0.2B
=> B = 20 / 0.2 = 100
收錄日期: 2021-04-23 00:10:09
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070301000051KK02519