1.If 18% of b is equal to 20% of b - 7,find the value of b.
2.45% of a number plus 3 is equal to 12.Find the number.
Maths question
2007-01-21 9:13 pm
回答 (2)
2007-01-21 9:20 pm
✔ 最佳答案
1. 0.18b = 0.2(b-7)0.18b = 0.2b - 1.4
0.02b = 1.4
b =70
2. Let x be the number
0.45x +3 = 12
0.45x = 9
x = 20
2007-01-21 9:23 pm
1. b x 18% = b x 20% - 7
0.18b = 0.2b -7
0.18b - 0.2b = -7
-0.02b = -7
b = 350
2. Let X be the number.
X x 45% + 3 = 12
0.45X + 3 = 12
0.45X = 9
X = 20
0.18b = 0.2b -7
0.18b - 0.2b = -7
-0.02b = -7
b = 350
2. Let X be the number.
X x 45% + 3 = 12
0.45X + 3 = 12
0.45X = 9
X = 20
參考: myself
收錄日期: 2021-04-12 22:43:39
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