In this task, you need to provide the correct option for a given problem from the provided options.

[EX Q]: Problem: there are 12 slate rocks , 16 pumice rocks , and 8 granite rocks randomly distributed in a certain field . if 2 rocks are chosen at random and without replacement , what is the probability that both rocks will be slate rocks ? 
Options: a ) 3 / 32 , b ) 7 / 64 , c ) 11 / 105 , d ) 15 / 127 , e ) 19 / 134
[EX A]: c

[EX Q]: Problem: rajat , vikas and abhishek are submitting questions in the ratio 7 : 3 : 2 . if total number of questions submitted by them is 24 . find the number of questions submitted by vikas . 
Options: a ) 3 , b ) 4 , c ) 5 , d ) 6 , e ) 7
[EX A]: d

[EX Q]: Problem: in a college the ratio of the numbers of boys to the girls is 5 : 7 . if there are 140 girls , the total number of students in the college is ? 
Options: a ) 200 , b ) 240 , c ) 160 , d ) 250 , e ) 310
[EX A]:
b