A 27 quartz capacity car radiator is filled with 18% alcohol solution. How many quartz be drained and then be replaced by a 90% alcohol solution for resulting solution to contain 42% alcohol? `7\ q u a r t z` b. `9\ q u a r t z` c. `11\ q u a r t z` d. `14\ q u a r t z`

Ram prepares solutions of alcohol in water according to customers' needs. This morning Ram has prepared 27 litres of a 12% alcohol solution and kept it ready in a 27 litre delivery container to be shipped to the customer. Just before delivery, he finds out that the customer had asked for 27 litres of 21% alcohol solution. To prepare what the customer u wants, Ram replaces a portion of 12% solution by 39% solution. How many litres of 12% solution are replaced?

How many L's are there which do not have R preceding them and also do not have T following them ? Z Q S T L R M N Q N R T U V X R L T A S L T Q R S L T

P, Q, R, S, T and U are standing in a queue. Q is just ahead of P. S is just behind T. U is NOT near R, who is separated from Q by two persons. Who is standing at the front of the queue?

If p : q = r : s = t : u = 2 : 3, then (mp + nr + ot) : mq + ns + ou) is equal to :

What should come next in the following letter series ? P Q P Q R P Q R S P Q R S T P Q R S T L P Q R S T U V P Q R S T

Select the set of letters that, when sequentially placed in the blanks of the given letter series, will complete the letter series. u_q_c_u r_z_n_r q_c n

Let R be a relation from Q to Q defined by R={(a,b):a,b in Q and a,b in Z}. Showt ^(^^){a,a) in R for all a in Q,{a,b}in R rArr that {b,a}in R,{a,b}in R and {b,c}in R rArr t widehat a,c in R