Question

In the following number series only one number is wrong. Find out the wrong number. 18000, 3600, 720, 144.2, 28.8, 5.76
(1) 5.76 (2) 720
(3) 144.2 (4) 28.8

Answer 1

The given number series is based on the following pattern :

18000÷5=360018000÷5=3600

3600÷5=7203600÷5=720

720÷5=144≠142.2720÷5=144≠142.2

144÷5=28.3144÷5=28.3

28.8÷5=5.7628.8÷5=5.76

Hence 142.2 is the wrong number.