So if Ella bought some ( amount ?) key chains for 24$ (in all) you have to divide
24/? so how many key chains do you think he has 5, 6, 7, 10 remember it cant have any cents so 24/5=4.08 which is four dollars and eight cents so not five 24/6=4 so 6 may be the answer 24/7 cannot be the answer because 7 cannot go into 24 equally and but not least 24/10=2.04
So the answer is 6 or 4$ hopes this helps.