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The average rainfall in a city for the first four days was recorded to be 0.40 inch. The rainfall on the last two days was in the ratio of 4 :

  1. 3.The average of six days was 0.50 inch. What was the rainfall on the fifth day ?
  1. A.0.60 inch
  2. B.0.70 inch
  3. C.0.80 inch
  4. D.0.90 inch
▶ Answer & Explanation

Correct answer: C. 0.80 inch

The total rainfall over the first four days can be calculated by multiplying the average rainfall by the number of days. Similarly, the total rainfall over six days can be found. The difference between the total rainfall for six days and the total rainfall for the first four days gives the total rainfall for the last two days. Given the ratio of rainfall on the last two days and the total rainfall for these two days, individual rainfall amounts can be determined.

Source: UPSC csat 2017

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