Topic : Number-Simple Calculation
from: category_eng
1.

2.

3.

4.

5.

6.

7.
how many integers between 1 and 10 inclusive.
8.

9.

10.
no Information about the time which he works.
11.

12.
(2) any 3 numbers...
13.
8*7/2.. Why?
14.

15.
Just focus on unit digits
16.

17.
Pleasee express your idea first. Don't try to calculate first. If you try to calculate 12600/12 first, you will get a trap. In the other hand, (12600/12) *4 can be calculated by (12600/3)
18.

19.
Pigeonhole principle
20.
(1)v=z=3 so,, r=3 (2)(s,t,u,x)=(1,2,1,2)... so r=3
21.
Use $600.. 12n<600
1. B
2. e
3. b
4. e
5.
6. a
7. D
how many integers between 1 and 10 inclusive.
8. B
9. C
10. E
no Information about the time which he works.
11. C
12. B
(2) any 3 numbers...
13. c
8*7/2.. Why?
14. A
15. E
Just focus on unit digits
16. E
17. A
Pleasee express your idea first. Don't try to calculate first. If you try to calculate 12600/12 first, you will get a trap. In the other hand, (12600/12) *4 can be calculated by (12600/3)
4580- (12600/12) *4
18. B
Understanding
Just count it.
19. A
Pigeonhole principle


(2) we don't know how many...
20. D
(1)v=z=3 so,, r=3 (2)(s,t,u,x)=(1,2,1,2)... so r=3
21. C
Use $600.. 12n<600