Instructions

In the following number series only one number is wrong. Find out the wrong number.

Question 111

18.3, 20.6, 16, 22.9, 13.7, 2.2, 11.4

Solution

Multiples of 2.3 are alternatively added and subtracted.

18.3 $$+ (2.3 \times 1)$$ = 20.6

20.6 $$- (2.3 \times 2)$$ = 16

16 $$+ (2.3 \times 3)$$ = 22.9

22.9 $$- (2.3 \times 4)$$ = 13.7

13.7 $$+ (2.3 \times 5)$$ = 25.2 $$\neq 2.2$$

25.2 $$- (2.3 \times 6)$$ = 11.4

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