The second one ate (2/3x)*( 1/3), leaving (2/3x)*(2/3).
The third one ate (2/3x)*(2/3)*( 1/4), leaving six peaches.
Ordered: x-(1/3x)-(2/3x) * (1/3)-(2/3x) * (1/4) = 6.
Solution: x= 18
Suppose this story book has x pages. I saw 1/3x on the first day, and now there are 2/3x left.
(2/3x)* 2/5+(2/3x)x2/5+24 = x- 1/3x
Solution: x= 180
3. Solution: Let the distance of floret be x and the time of Xiao Bing be t, then the distance of Xiao Bing is 5x/4 and the time of floret is 4t/3.
The speed of Xiaohua is higher than that of Shangxiaobing (v1:v2 = x/(4t/3): 5x/4t = 3: 5).
4. The circumference of rectangle = the circumference of circle +2 radius =3. 14*2* radius+radius
So the radius is: 8. 28/(3。 14*2+2)= 1 cm
Area: 3. 14* 1* 1=3。 14 cm2
5. 180* 1+200*5+ 195*4- 1800/ 180* 10=0.0888
6. Forty percent minus twenty-five percent equals fifteen percent, twelve divided by fifteen percent equals eighty pages, and eighty times three fifths equals forty-eight pages.
7. Save two 1 year interest.
(2000*2.25%* 1+2000)*( 1-5%)=2042.75
(2042.75 * 2.25% *1+2042.75) * (1-5%) = 2084.28 * * The interest is 84.28.
Direct deposit of interest for 2 years
2000*2.7%*2*( 1-5%)+2000=2 102.6
2102.6-2084.28 =18.32 yuan
8. Original price =62÷( 1-69%)=200 yuan.
Current price =200-62= 138 yuan.
9. 12.5×( 1+2/5+ 1)÷ 15%
= 12.5× 12/5÷ 15%
=200
A: There are 200 tons in the warehouse.
10. Three-year Treasury bills
1 1. Set chicken x rabbit y.
2X+4Y= 100
2Y+4X= 140
Just solve the equation. . X=30 Y= 10
12. Suppose there are 2 cents of X coins and 5 cents of Y coins ~
So we can get two equations ~ ① 2x+26 = 5Y2x-Y = 8.
X=8+y ~ can be obtained from ②.
If ① is brought in, we can get a linear equation ~ 2(8+y)+26=5y.
Finally y= 14~ and then x=8+y=8+ 14=22 ~
So there are 22 nickels and 14 nickels ~
13. Backward, (1+1) ÷1/2 = 4 (root), (4+1) ÷1/2 =/kloc.
14. The same
So tired!