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

[EX Q]: Problem: if 0.4 of a number is equal to 0.07 of another number , the ratio of the numbers i 
Options: a ) 2 : 3 , b ) 7 : 40 , c ) 3 : 20 , d ) 20 : 3 , e ) none
[EX A]: b

[EX Q]: Problem: bag a contains red , white and blue marbles such that the red to white marble ratio is 1 : 3 and the white to blue marble ratio is 2 : 3 . bag b contains red and white marbles in the ratio of 1 : 4 . together , the two bags contain 60 white marbles . how many red marbles could be in bag a ? 
Options: a ) 1 , b ) 3 , c ) 4 , d ) 12 , e ) 8
[EX A]: d

[EX Q]: Problem: how many multiples of 10 are there between 100 and 10000 ( both are inclusive ) ? 
Options: a ) 456 , b ) 789 , c ) 991 , d ) 1020 , e ) 1100
[EX A]:
c