AFCAT I 16 Feb 2019 Paper

(a) Total Rain fell of 12 months = 2.7 x 12 = 32.4
Total Rain fell of first 7 months = 7 x (2.7 - 1.1) = 11.2
Rain fall of last month
= 32.4 - (11.2 + 20.3)
= 32.4 - 31.5
= 0.9