Compare the knowledge of persons X, Y, Z, A, B and C in relation to each other :
1. X knows more than A.
2. Y knows as much as B.
3. Z knows less than C.
4. A knows more than Y.
The best knowledgeable person amongst all is :
In the following list of letters, how many O's are followed by Q's but not preceded by D's ? D O Q O D Q O D O D Q D O Q D S D Q P O Q D S S S D O Q O Q D O Q D D D O Q
In following number series, two terms have been put within brackets. Choose the appropriate option - Look at this series: 80, 10, 70, 15, 60, . . . What number should come next?