If 50% of (x - y) = 30% of (x + y), then what per cent of x is y? (a) 25% (b) 33 -% (c) 40% (d) 400% 3 (b) 33%
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m50% of (x -y) = 30 of (x +y)
50 (x -y) = 30 (x +y)
50x - 50y = 30x + 30y
20x = 80y
y/x = 20/80
% of x is y = (20*100)/80 = 25%.
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