Question 111

The average of four numbers A, B, C and D is 40. The average of four numbers A, B, E and F is also 40. (A, B are common). Which of the following must be true ?

Solution

A+B+C+D = 40*4 = 160

A+B+E+F = 40*4 = 160

So, A+B = 160 - C - D = 160 - E - F

So, C + D = E + F

Option b) is the correct answer.


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