Averages | Questions 10 to 12 | LOD 2 | Quantitative Aptitude | Cat | Arun Sharma

10. The average of the marks of ten students in a test was 4.4. The test comprised ten questions, each carrying one mark, 1 for incorrect answers and 0 for unattempted questions. However, the answer to one of the question was eventually changed during evaluation, because of which the average became 3.8. How many students had not earned any marks for the question that was removed if no one gained in this change?

11. At a science lab, a student was given 4 liters of a mixture of HCL and NaOH containing 20% NaOH. Out of curiosity, he added IL of similar mixture containing 30% NaOH. He further added 1 liter of NaOH to the new mixture. What is the percentage of HCl in the resulting concoction?

(a) 35%

(b) 65%

(c) 25%

(d) 45%

12. There are twelve distinct natural numbers such that the average of the three smallest numbers is 17, and the average of the three largest numbers is 32. The maximum possible value of the average of these twelve numbers is.

(a) 27

(b) 26

(c) 34.66

(d) 25

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