Question by Quoc Tran Anh Le

07/08/2018 at 02:10

Math Puzzles

Dao Trong Luan Coordinator 07/08/2018 at 03:23

Their average is: \(\dfrac{6+7+42}{16}=\dfrac{55}{16}=3,4375\)
Quoc Tran Anh Le selected this answer.
Lê Anh Duy 07/08/2018 at 10:07

The sum of 7 numbers is: \(6\times7\) = 42

The sum of 6 numbers is: \(7\times6\) = 42

The sum of 3 numbers is \(42\times3\) = 126

So the average of these number is: \(\dfrac{42+42+126}{16}=13.125\)

(The average of group A, B, C can't be the average of the average of group A, B, C)