請幫忙下數學題列式
1) A's weight is 3 kg more than twice that of B's . If A weights 47 kg, what is B's weight?
2) After coveing 15% of the journey in the morning and 33% of it in the afternoon, Amy found that she still had 260km left. Find the total distance of the journey.
3) An aeroplane flies at an average speed of 950km/h from P to Q and back. P and Q are 1140 km apart. Find the flying time.
請幫忙下數學題列式
2007-07-16 9:45 pm
回答 (1)
2007-07-16 9:52 pm
✔ 最佳答案
( 1 ) Let B weighs x kg. 2x + 3 = 47
2x = 44
x = 22
So B weighs 22 kg.
( 2 ) Let the total distance of the journey be x km.
15% x + 33% x + 260 = x
0.52x = 260
x = 500
So the total distance of the whole journey is 500km.
( 3 ) The total distance of the whole journey = 1140 x 2 = 2280 km
The flying time : 2280 / 950 = 2.4 h
參考: My Maths Knowledge
收錄日期: 2021-04-23 17:09:41
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