Instructions

Each question given below is followed by three statements. Study the question and
the statements. Identify which option is necessary to answer the question.

Question 43

# The mean temperature of Monday to Wednesday was 37 degree Celsius and of Tuesday to Thursday was 34 degree. What was the temperature on Thursday?I. The temperature on Thursday was $$\frac{4}{5^{th}}$$ that of Monday.II. The mean temperature of Monday and Thursday was 40.5 degree Celsius.III. The difference between the temperature on Monday and that on Thursday was 9 degree Celsius.

Solution

Let the temperature on Monday, Tuesday, Wednesday and Thursday be a,b,c and d respectively

It is given that a+b+c = 3*37 = 111...(I)

Â  Â  Â  Â  Â  Â  Â Â and b+c+d = 3*34 = 102 ... (II)

Using statement (I) alone we getÂ $$d\ =\ \ \frac{\ 4}{5}a$$. Which can be put in eqn (I), after which we can obtain the value of d

Using statement (II) alone we can add eqn(I) and eqn(II) to get value of b+c and it can be used to get value of d from eqn(II)

Using statement (III) alone we a-d = 9 which can be obtained by eqn(I) and (II) and n hence no new information is given. Statement (III) is no sufficient to get the required answer.

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