In the following series one number is wrong, find out the wrong number. 53.9, 52.7, 50.3, 46.7, 40.9, 35.9, 28.7

Explanation

The pattern is as follows: Taking difference ⇒ 53.9 − 52.7 = 1.2; 52.7 − 50.3 = 2.4; 50.3 − 46.7 = 3.6; 46.7 − 40.9 = 5.8 (46.7 − 41.9 = 4.8); 40.9 − 35.9 = 5 (41.9 − 35.9 = 6); 35.9 − 28.7 = 7.2. ∴ 40.9 is wrong and should be replaced by 41.9.