SSC CGL 10 Aug 2017 Shift 1 Paper

Import of year 1
$=3800\times \frac{9}{19}=1800$
Export of year 1
$=3800\times \frac{10}{19}=2000$
Import of year 2
$=3600\times \frac{7}{18}=1400$
Export of year 2
$=3600\times \frac{11}{18}=2200$
Import of year 3
$=2800\times \frac{3}{7}=1200$
Export of year 3
$=2800\times \frac{4}{7}=1600$
Import of year 4
$=3900\times \frac{8}{13}=2400$
Export of year 4
$=3900\times \frac{5}{13}=1500$
Import of year 5
$=5000\times \frac{13}{25}=2600$
Export of year 5
$=5000\times \frac{12}{25}=2400$
Average import = $\frac{1800+1400+1200+2400+2600}{5}$
$=\frac{9400}{5}=1880$
Average export $=\frac{2000+2200+1600+1500+2400}{5}$
$=\frac{9700}{5}=1940$
∴ Required difference $=1940-1880=60$