(1) A hawker sold 1500 pieces of key chauns at a loss of 20%. He lost a total of $6000. Find the cost price of each key chain.
(2) A cat and a dog are not satisfied with their weights. If the weight of the cat is increased by 20% while that of the dog is decreased by 10%, their weights will be the same. What percentage of the dog's original weight is the cat's original weight ?
Tks very much
maths summer agsinment (2)
2014-08-06 6:48 pm
回答 (1)
2014-08-06 7:24 pm
✔ 最佳答案
(1)Let $y be the cost price of each key chain.
1500y × 20% = 6000
1500y = 30000
y = 20
Cost price of each key chain = $20
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(2)
Let C and D be the cat's original weight and the dog's original weightrespectively.
C(1 + 20%) = D(1 - 10%)
1.2C = 0.9D
C/D = 0.9/1.2
C/D = (0.9/1.2) × 100%
C/D = 75%
C = 75% × D
The cat's original weight is 75%of the dog's original weight.
參考: 土扁
收錄日期: 2021-04-15 16:11:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140806000051KK00038