If a survey ask 120 people what their favorite color is and 12 say blue 100 say green and 8 say red what is the percent of those who like red and blue.

Ok, so we know 8/120 people say red is their favorite color.  So what you need to do is divide 8 by 120.  That will give you a decimal, 0.06666666666.  Which you can round to 0.07.  0.07 is the same as 7%.  Hope this helped, and if you need help with any questions in the future, don't hesitate to message me.

Twenty ignore the other numbers and do 8+12=20