Explanation:
No book is pen and all pens are pencils does not mean no book is pencil (pencils may include other things). Some pencils are pens follows by conversion. Only II.
A walks 10 metres in front and 10 metres to the right. Then every time turning to his left, he walks 5, 15 and 15 metres respectively. How far is he now from his starting point?
Explanation:
Assume start facing North 10 m. Right (East) 10 m. Left (North) 5 m. Left (West) 15 m. Left (South) 15 m. Net: North 10+5−15=0, East 10−15=−5 (5 m West). Distance 5 m.
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