Question 885623
Out of 8000 candidates , 60% were boys.if 80% boys and 90% of the girls passed the exam, find the number of candidates who failed?
Solution 
number of boys are = 60% of 8000= 8000x.6 = 4800
girls will be   =8000-4800=3200
80% boys passed fail boys are 20% 
fail boys   are  20% of 4800= .2x4800= 960
90%  girls are  passed   10 % failed 
failed girls are = 10% of 3200 =.1x3200  = 320

number of candidate failed are (boys +girls ) =960 +320 =1280
total failed candidate are = 12080