Answers

2015-05-18T11:30:50+05:30
As you say they vary directly. when x is 12 y is 18
  then, if x become half=6 then y also  become equal to 9(when 18 is halved it become 9)
after it if we divide x by 3 it become 2 and y become 3
therefore 2,3 isn't the answer

after that, if we multiply x that is equal to 12 by 2/3 it become 8 and y become= 12   (18*2/3 =36/2=8)
therefore 8,12 isn't the answer

after that if we multiply x that is equal to 12 by 25/12 it become=25 and y that is equal to 18=37.5
therefore 25,37.5 isn,t the answer

this mean answer of this question is 15,20 
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2015-05-18T11:45:25+05:30

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X  / y  = constant       when  they vary directly with each other.

given    x/y = 12 / 18  = 2/3             

i) ok
2)  8/12 = 2/3    ok
3)  15/20 = 3/4  nok
4)  25/37.5  = 2/3  ok

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