Question

Average of 12 numbers is 55, sum of first 3 numbers is 85. Then find the 4th number?​

Answer 1

Answer:

Correct option is

A

25

Sum of 6 numbers =60×30=180

Sum of first 4 numbers =4×25=100

Sum of last 3 numbers =3×35=105

∴ Fourth number =(100+105)−180

=205−180

=25