She has 84 pictures and 12 others were bad for a total of 84+12 = 96 pictures were taken.
Divide the total pictures taken by 24 per roll:
96 / 24 = 4
She used 4 rolls of film.
Find the total pictures taken:
Total pictures that turns out good = 84
Total pictures that turns out spoilt = 12
Total pictures taken = 84 + 12 = 100
Find the number of rolls used:
1 roll = 24 pictures
Number of rolls = 100 ÷ 24 = 4.17
Adelle has used a little more than 4 films
Adelle has used 5 rolls of films
Answer: Adelle used 5 rolls of films
hope this help you
