Q42 and Q165 Correction by Lewis

Q42： f1=9/5*c1+32, F2=9/5*c2 +32, c2=c1+10

get F2-f1=9/5*(c2-C1)=9/5*10=90/5=18

Q165: (Lu: I can bet my head for the accuracy of this question!)

In the decimal representation of x, where 0 < x < 1, is the tenths digit of x nonzero?

(1)   16x is an integer.

(2)   8x is an integer.

1. if 16x is an integer, then x could be 1/2, 1/4, 1/8, 1/16

                                                                 3/4  3/8  3/16

                                                                         5/8  5/16

                                                                         7/8  7/16

                                                                                 9/19,11/16,13/16, 15/16

or we can do that: x=1/16 *(1,or 2, or 3, or 4,,,,,till 15), unsufficey

2. we can find X=1/8 * (1,2,3,4,5,6,7)=0.125* (1,2,3,....7),,ok

......到底是B or E?

来顶路易斯老师的~~~~