The cost of tea A is $30 per kg ,the cost of tea B is $20 per kg .
If w kg of tea A and (w+1) kg of tea B are mixed together ,
and the cost of the mixed tea is $24 per kg.
Find w.
The height of a small tree is h cm.One month later ,its height increases by 28% to 44.8,find the value of h .
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2007-07-23 5:41 pm
回答 (2)
2007-07-23 5:50 pm
✔ 最佳答案
The cost of tea A is $30 per kg ,the cost of tea B is $20 per kg . If w kg of tea A and (w+1) kg of tea B are mixed together ,
and the cost of the mixed tea is $24 per kg.
Find w.
30w + 20(w + 1) = 24 (w + w + 1)
30w + 20w + 20 = 48w + 24
50w + 20 = 48w + 24
2w = 4
w = 2
The height of a small tree is h cm.One month later ,its height increases by 28% to 44.8,find the value of h .
h(1 + 28%) = 44.8
h = 44.8 / (1 + 28%)
H = 35
2007-07-23 6:17 pm
第一條 有無打錯問題!?
如果無打錯的話
w=0.08
the analysis is :
30w+20(w+1)=24
30w+20w+20=24
50w=24-20
50w=4
w=4/50
w=0.08
而第2條. . .
the analysis :
hx(1+28%)=44.8
h=44.8/1.28
h=35
解釋方面. . .
有唔明先再e-mail我慢慢解你聽
如果無打錯的話
w=0.08
the analysis is :
30w+20(w+1)=24
30w+20w+20=24
50w=24-20
50w=4
w=4/50
w=0.08
而第2條. . .
the analysis :
hx(1+28%)=44.8
h=44.8/1.28
h=35
解釋方面. . .
有唔明先再e-mail我慢慢解你聽
參考: 自己計的 ^^"
收錄日期: 2021-04-12 20:39:42
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