Q.  The average age of 30 students of a class is 14 years 4 months. After admission of 5 new students in the class the average becomes 13 years 9 months. The youngest one of the five new students is 9 years 11 months old. The average age of the remaining 4 new students is
(A) 11 years 2 months 
(B) 13 years 6 months 
(C) 10 years 4 months
(D) 12 years 4 months
(E) None of these 42.

Q. If  x=a^{1 /2}+ a^-1/2 ,  y =  a^l/2— a^-1/2, then value of (x^​4 - x² y² — 1) + (y⁴ — x²y² + 1)
(A) 9
(B) 25
(C) 14
(D)16
(E)None of these

Q.A man purchases some oranges at the rate of 3 oranges for Rs. 40. and  the same quantity at 5 oranges for Rs. 60. If he sells all the oranges at the rate of 3 oranges for Rs. 50, find his gain or loss percent (to the nearest integer).
(A) 34 % loss
(B) 32 % profit 
(C) 31 % profit 
(D) 31 % loss 
(E) None of theses.