There are 820 people at a stadium. 65% of them are adults, 20% of them are boys, and the rest are girls. How many girls are there at the stadium?

There are 164 girls. you have to add 20+65 equal 85 to find the total between adult and boys. then subtract from 100 it equals 20 the multiply 820 times 20 = 16400 and divide it by 164

100% - 65% - 20% = 15% girls.

15% = 0.15

820 * 0.15 = 123 girls