Book Maths Puzzle Numerical Ability

THE ODDS AGAINST AN EVENT ARE 11:7.FIND THE PROBABILITY THAT THE EVENT WILL OCCUR
A) 7/11
B) 4/11
C) 11/18
D) 7/18

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Book Other Question

A book having 700 pages has its pages numbered from 1 to 700. If we count all the 3’s in the page numbers, how many 3’s will be there if ZN+XT=TZ
AND ZV+ZR=ZJR
THEN Z+Z=?

a) Z b) X c) ZX d) XZ