數學題 QUICK X 100000000000000000

2007-12-06 11:58 pm
1) x is 50%=Y. Z is 30% bigger than Y. If X+Y+Z=56. Find Z.

2)There is a box of pears. 2.5% of it is rotten. 5.5% is eaten up. 50% of the rest is being sold. There are still 92 pears left behind. Find the original amount of pears in the box.

3)From Q1, find the difference between X and Z.

4)Class A tea costs 25% more than class C tea. Class A tea is agaon cost 20% more than class B tea. If class B tea is sold at $5.4 each g, how much will class Ctea cost each g.
更新1:

klhk23: 1)x=10,y=20,z=26 3)z-x=16 你點知x=10,y=20,z=26 我要式 我夠知答案la 使鬼你教

更新2:

5好意思 我5記得話 no方程式

更新3:

快d 快d 如果5是5卑分你地ga

回答 (3)

2007-12-07 12:32 am
✔ 最佳答案
1)compare the relationship between X,Y and Z:
2X=Y, Z=1.3Y=2.6X
X+Y+Z=56
X+2X+2.6X=56
5.6X=56
X=10
so Z=2.6*10=26
3)the distance between Xand Z:
Z-X
=26-10
=16
2)Let the number of peans be x.
2.5% of it is rotten,5.5% is eaten up:X(1-2.5%-5.5%)=0.92X
50% of the rest is being sold:0.92X/2=0.46X
so 0.46X=92
X=200
Let the number of peans are 200
4) The cost of Class A tea:5.4(1+20%)=$6.48
The cost of Class C tea:$6.48*(1-25%)=$4.86
參考: me
2007-12-07 12:14 am
1)x=10,y=20,z=26
3)z-x=16
2007-12-07 12:10 am
1.y=0.5x,therefore,x=2y
1.3y=z
For all this result,2y+y+1.3y=56
y=56/4.3


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