Solution:In city A,
Total people = 400 + 700 = 1100
People consumed alcoholic beverage = 400
Alcoholic beverages consumed by male = (400 + 200)/2 = 300
Alcoholic beverages consumed by female = 400 − 300 = 100
People consumed non-alcoholic beverages = 700
Females consumed non-alcoholic beverages = (700 + 40)/2 = 370
Males consumed non-alcoholic beverages = 700 − 370 = 330
In city B,
Total people = 500 + 200 = 700
People consumed alcoholic beverage = 500
Alcoholic beverages consumed by male = (2/(3+2)) × 500 = 200
Alcoholic beverages consumed by female = 500 − 200 = 300
People consumed non - alcoholic beverages = 200
Females consumed non-alcoholic beverages
= 150 / (100+150) × 200 = 120
Males consumed non-alcoholic beverages = 200 − 120 = 80
In city C,
Total people = 600 + 180 = 780
People consumed alcoholic beverage = 600
Alcoholic beverages consumed by female = 5/(7+5) × 600 = 250
Alcoholic beverages consumed by male = 600 − 250 = 350
People consumed non - alcoholic beverages = 180
males consumed non-alcoholic beverages = 50/(100+50) × 180 = 60
Females consumed non-alcoholic beverages = 180 − 60 = 120
Required answer = 350 − 300 = 50