6. The “reflection” of a positive integer is obtained by reversing its digits. For example， 321 is thereflection of 123. The difference between a five-digit integer andits reflection must be divisible by which of the following?
A.2 B.4 C.5 D.6 E.9
7. Column A： 1/(1-0.03)
Column B： 1.03
8.The original value of machine X is V dollars， while theoriginal value of machine Y is 2V dollars. Both machinesdepreciate in value at a constant rate of 10 percent of their original valueper year.
Column A： The value of machine X after 3 years
Column B： The value of machine X after 6 years
9. If n is an odd integer， which of thefollowing is the square of the next larger odd integer?
A. n*n+1 B. n*n+4 C. n*n+2n+1 D. n*n+4n+1 E.n*n+n+1
10. If 55 percent of a group of people have brown hair and 80 percentof the same group do not have red hair， what fraction ofthose who do not have brown hair red hair?
A. 1/4 B.4/11 C.4/9 D.5/9 E.4/5