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tanyajoseph
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If r,sand w are positive nos such that w = 60r+80s and r+s=1, is w <70?
1) r>0.5
2)r>s
1) r>0.5
2)r>s
Lets say r = 0.5 so s= 0.5
Then w = 70
But r>0.5 which means as r increases, s decreases which means w will always <70 (try with r = 0.6)
So A is sufficient
From 2 we get nothing
Hence A