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three men A, B, C married with P,Q,R but not in same order. A,s wife and Q's husband playing ludo with P and R 's husband . no wife partners her husband and B does not play ludo. who married with with B?- MARRIAGE REASONING

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In a class of 60 students, how many students play only hockey? I) 30 students donot play cricket and 20 donot play hockey. II) The sum of number of students who play both cricket & hockey and the number of students who play neither cricket or hockey is 10.
a) Statement I is alone sufficient
b) Statement II alone is sufficient
c) Both are needed
A water tank has M inlet pipes and N outlet pipes. An inlet pipe can fill the tank in 8 hours while an outlet pipe can empty the full tank in 12 hours. If all pipes are left open simultaneously, it takes 6 hours to fill the empty tank. What is the relationship between Mand N?

a. M:1=1:1
b. M:N=2:1
c. M:N=3:2
d. None of the above