# 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=a1/2+ a-1/2 ,  y =  al/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.

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