The average raining on Sunday Monday and Tuesday is 12cm and that of for Monday Tuesday and Wednesda...........

Quantitative Aptitude (CDS) Average

The average raining on Sunday, Monday, and Tuesday is 12cm and that of for Monday, Tuesday, and Wednesday is 14 cm. If the rainfall on Sunday is 9cm. What is the rainfall recorded on Wednesday?

14cm

15cm

16cm

20cm

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Explanation:

Average of Sunday, Monday and Tuesday = 12cm
Average of Monday, Tuesday, and Wednesday = 14cm
rainfall of Sunday = 9 cm
First 3 sun,mon,tues
12×3 = 36
36 - 9 = 27 = (monday and tuesday)
last 3 mon, tues, wed.
3×14 = 42
42-27 = 15
wednesday = 15cm