Question

The averange rainfall for three months is 12 cm. If the rainfall for the first two months is 13 cm and 15 cm respectively find the rainfall for the third month.​

Answer 1

Answer:

8 cm

Explanation:

Average rainfall = rainfall in 1st month + 2nd month + 3rd month/3

According to question:

13+15+x/3=12

28+x/3=12

28+x=36

x=36-28

x=8

Therefore, rainfall in the 3rd month = 8 cm

Answer 2

Answer:

8cm

Explanation:

Average rainfall= 12cm

Let Rainfall for first month be A_{1}      = 13cm

                        Second month= A_{2} =  15cm

                        Third month= A_{3}

Avg Rainfall = A_{1}  + A_{2} + A_{3}  / 3

12= 13+ 15 + A_{3} /3

36= 13+ 15 + A_{3}

A_{3}= 36-13-15

         = 8cm

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