Question

in an examination there was 640 boys and 360 girls in which 60% of the boys and 80% of the girls were successful then what is the percentage of failures

Answer 1

number of boys that are successful = (640*(60/100)) = 384

number of girls that are successful = (360*(80/100)) = 288

now,

number of boys failed = 640 - 384 = 256

number of girls failed = 360 - 288 = 72

% of boys that are failed= (256/640)*100 = 40%

% of girls that are failed= (72/360)*100 = 20%