1) A boat goes up-stream 6km in 1 hours , and it also goes dowm-stream 28km in 2 hours . Find the rate of the stream and of the boat.
2) A certain number of two digits is seven times the sum of its digits. If 36 is subtracted from it, the digits will be reversed. Find the number.
F.4 maths(急!!!!)10分！！！
2008-09-30 5:37 am
回答 (1)
2008-10-01 11:45 pm
✔ 最佳答案
1. The rate of the stream is 4 km/hr.The rate of the boat is 10 km/hr.2. let the tenth digit of the no. be D, the unit digit of the no. be E,
10E+D......(2)
參考: my maths knowledge
收錄日期: 2021-04-19 20:33:04
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