"This question contains a question and two statements labelled I and II giving certain data. You have to select the correct answer from (A) to (D) depending on the sufficiency of the data given in the statements to answer the question.
There are four friends — A, B, C and D. What is the difference in the marks obtained by A and D?
I. The difference in the marks obtained by A and C is 20 and that in the marks obtained by B and D is 15.
II. The difference in the marks obtained by B and C is 18. B got the highest marks.
Answer & explanation
Correct answer: option 3
I. The difference in the marks obtained by A and C is 20 and that in the marks obtained by B and D is 15.
A - C = 20 & B + D = 15
II. The difference in the marks obtained by B and C is 18. B got the highest marks.
B - C = 18
By using both statement ,
A + B = 20 + 18 = 38 ---(1)
B + D = 15 ---(2)
On subtracting equation 1 and 2,
A - D = 38 - 15 = 23
So,
If the question can be answered by using both statements together but cannot be answered by using the statement alone.