Four hundred multiples of seven are chosen at random, and 100 multiples of eight are chosen at random. Approximately what percentage of the 500 selected numbers are odd?  Choose the correct answer:
A) 30%
B) 50%
C) 60%
D) 55%
E) 40%
--&gt; Multiples of 7 are 7, 14, 21, 28, 35, 42....   Out of first 4 multiples, 2 are odd; out of first 6 multiples, 3 are odd.   So approx. 50 % of the 400 multiples are odd i.e 200 multiples.   --&gt; Similalrly, for 8 multiples are:8,16,24...   All are even so 0 % are odd.   Total odd= (200+0)/(400+100)= 200/500=(2/5) = 40%   Answer 40%
<result>E</result>
Four hundred multiples of seven are chosen at random, and 100 multiples of eight are chosen at random. Approximately what percentage of the 500 selected numbers are odd?