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Question

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Decide whether the data provided in the statements numbered I and II is sufficient to answer the given question.
Question:

What is the ratio of boys to girls in a class?

Statements:

I. There are 20 boys in the class.

II. The ratio of girls to the number of students in the whole class is 3 : 7

This question was previously asked in
RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 1)
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  1. Either statement I or II is sufficient
  2. Statement I alone is sufficient while II alone is not sufficient 
  3. Statement II alone is sufficient while I alone is not sufficient.
  4. Neither statement I nor II is sufficient.

Answer (Detailed Solution Below)

Option 3 : Statement II alone is sufficient while I alone is not sufficient.
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Detailed Solution

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I. There are 20 boys in the class.

From this we cannot find the ratio of boys to girls in the class.

II. The ratio of girls to the number of students in the whole class is 3 : 7

So, the ratio of boys to girls in the class is 4 : 3.

Hence, statement II alone is sufficient while I alone is not sufficient. 

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