Respuesta :

nobrains
First add them up to to find the total. 320+180=500. 320 out of 500 is 320/500, which is 0.64, which is 64%.
pegah
if we have 320 girls and 180 boys so the total number is 320 + 180 = 500 so the percent of girls will be:
320/500 = ?/100 
so ? is your answer:
320 * 100 /500 = 64% :)))
i hope this is helpful
have a nice day