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let white balls be x in no. and red balls be y in no.
=>1/2x=1/3y
=>3x=2y
=>3x-2y=0 -------1.
=>2(x+y)+8=3y
=>2x+2y+8=3y
=>2x+2y-3y=-8
=>2x-y=-8 -------2. ×2
subtracting 2 from 1
3x-2y=0
4x-2x=-8
-. +. +
-----------------
-x. =. 8
no. of white balls = x= 8
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