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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

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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