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6:180::9:---     ie 6/180=9/x 0r x=180 x9/6=270
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options area)729 b)738 c)632 d)648
270 is the missing no.
Well I got this no. by dividing 180 by 6 (as it is in ratio) the ans came 30 so same way i multiplied 30 with 9 and got the answer 270.....hope it is helpful to u.
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