In the recent, climate conference in New York, out of 700 men, 500 women, 800 children present inside the building premises, 20% of the men, 40% of the women and 10% of the children were Indians. Find the percentage of people who were not Indian?

Answer: Option C

Number of Indians men present there = $$\frac{700\times 20}{100}=140$$
Indian women = $$\frac{500\times 40}{100}=200$$
Indian children = $$\frac{800\times 10}{100}=80$$
Total member present in climate conference = 700 + 500 + 800 = 2000
Total Indian = 200 + 140 + 80 = 420
Hence, % of Indian present there = $$\frac{420\times 100}{2000}=21\%$$
% of people who were not Indian = 100 - 21 = 79%