4) Tom is cycling at a speed of 12km/h, that is only 25% of the speed of a ca, wt is the speed of the car?
5) After eating 40% of the rice, there is still 24% kg left, how many kg of rice are there in the bag?
6) 30% of a certain number is 120, then how much is 20% of that number?
數學--英
2008-01-17 3:05 am
回答 (3)
2008-01-17 7:24 am
✔ 最佳答案
4)12÷25%
=12÷0.25
=48
so, the speed of the car is 48km/h
5)
24÷(1-40%)
=24÷0.6
=40
so, there are 40kg rice in the bag
6)
120÷30%
=120÷0.3
=400 ...certain number
400×20%
=80
so, 20% of certain number is 80
2008-01-18 6:43 am
4) 12 / 25% = 48km/h
5) 24 / 60% = 40kg
6) ( 120 / 30% ) X 20% = 80
5) 24 / 60% = 40kg
6) ( 120 / 30% ) X 20% = 80
2008-01-17 3:20 am
4) 12km/h 乘25%=12乘1/4=3km/h
5)唔識
6) the value of certain number
=120除30%
=400
20% of that number
=400乘20%
=80
2008-01-16 19:23:20 補充：
5) let x kg be the original kg of rice x(1-40%) = 24 x = 24除(60%) x =40
5)唔識
6) the value of certain number
=120除30%
=400
20% of that number
=400乘20%
=80
2008-01-16 19:23:20 補充：
5) let x kg be the original kg of rice x(1-40%) = 24 x = 24除(60%) x =40
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