Two pipes, X and Y, can individually fill a tank in 50 minutes and 25 minutes respectively. If both pipes are opened simultaneously, after how much time should pipe X be closed so that the remaining part of the tank is filled in 10 minutes by pipe Y alone?
ATQ, Both pipes are opened simultaneously. Let 'w' be the minutes after which pipe X is closed 
Pipe X should be closed after 10 minutes.
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A few browns are oranges.
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No white are blues.Â...
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All Sandals are Laces
Only Lace is buckle
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I. Some Heels are La...
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Some fingers are hands.
No hand is a nail.
Conclusions:
I. Some fingers are not nails.
II. All nails can be fingers.
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Only a few Smart is Beautiful.
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All bajajs are Hero.
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Only Black is Red.
No Black is White.
Some White are Brown.
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Some Brown can be Red.
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