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Q.

The average temperature of the town in the first four days of a month was 58 degrees. The average for the second, third, fourth and fifth days was 60 degrees. If the temperatures of the first and fifth days were in the ratio 7 : 8, then what is the temperature on the fifth day? 

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a

64 degrees 

b

62 degrees 

c

56 degrees     

d

Data inadequate 

answer is A.

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Detailed Solution

Given that average temperature of the town in the first four days of a month was 58 degrees and average for the second, third, fourth and fifth days was 60 degrees

a+b+c+d4=58a+b+c+d=458a+b+c+d=232

Given 

b+c+d+e=460 b+c+d+e=240 b+c+d=240-e

a+240-e=232a-e=-8e-a=8

Given that the temperatures of the first and fifth days were in the ratio 7 : 8

8x-7x=8x=8

Therefore, the temperature in fifth day is 88=64 years

 

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