2.The cost of tea A is %30per kg,the cost of tea Bis $20per kg.If w kg of tea A and (w+1)kg of teaB are mixed together,and the cost of the mixed tea is %24 per kd.Find w.
更新1:
2 z=- +3 3. 5
更新2:
3. 2 z= - z+3 5
E條英文點解
2009-08-05 10:06 pm
1.If the two adjacent side of a square measuure x cm and (2x-3)cm respectively,find the perimeter of the square.
2.The cost of tea A is %30per kg,the cost of tea Bis $20per kg.If w kg of tea A and (w+1)kg of teaB are mixed together,and the cost of the mixed tea is %24 per kd.Find w.
2.The cost of tea A is %30per kg,the cost of tea Bis $20per kg.If w kg of tea A and (w+1)kg of teaB are mixed together,and the cost of the mixed tea is %24 per kd.Find w.
回答 (1)
2009-08-05 10:55 pm
✔ 最佳答案
1.If the two adjacent side of a square measure x cm and (2x-3)cm respectively, find the perimeter of the square.（若正方形兩鄰邊分別量得 x cm 及 (2x - 3) cm，求正方形的周界。）
2x - 3 = 3
2x = 6
x = 3
Perimeter of the square
= (3 cm) x 4
= 12 cm
2.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, the cost of the mixed tea is $24 per kg. Find w.
（A 茶的成本每公斤 $30，B 茶的成本每公斤 $20。若把 w 公斤 A 茶與 (w+1) 公斤茶 B 混合，混合茶每公斤成本是 $24。計算 w。）
The total cost of the tea:
30w + 20(w + 1) = 24[w + (w + 1)]
30w + 20w + 20 = 48w + 24
2w = 4
w = 2
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