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Data Sufficiency - Verbal and Reasoning

Directions to SolveIn each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements andGive answer
  • (A) If the data in statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question
  • (B) If the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question
  • (C) If the data either in statement I alone or in statement II alone are sufficient to answer the question
  • (D) If the data given in both statements I and II together are not sufficient to answer the question and
  • (E) If the data in both statements I and II together are necessary to answer the question.
Q1:

Question: How many doctors are practising in this town ? Statements:
  1. There is one doctor per seven hundred residents.
  2. There are 16 wards with each ward having as many doctors as the number of wards.

A I alone is sufficient while II alone is not sufficient

B II alone is sufficient while I alone is not sufficient

C Either I or II is sufficient

D Neither I nor II is sufficient

E Both I and II are sufficient

ANS:B - II alone is sufficient while I alone is not sufficient

Explanation: From I, total number of doctors in town = (1/700 x N) , where N = total number of residents in town. But, the value of N is not known. From II, total number of doctors in town = (Number of wards in town) x (Number of doctors in each ward) = 16 x 16 = 256.