Question

Average of 18 numbers is 38 if 9 is added in total then what will be the average

Answer 1

Concepts used :

1) Deriving conclusions from given equations and things.

2) Using the conclusions to find unknown value.

3) Forming equations

4) Solving equation

5) Substituting the values to a variable

6) Formula to calculate average

Average = Sum of terms / No. of terms

Remember : Average changes when a new no. is added