Assuming that the probability of boys and girls is equal (in reality slightly more boys than girls are born), the probability is 1/2, simply because the older girl's gender is given and therefore not a part of the probability.
This question comes from the 'boy or girl paradox', a.k.a. the Mrs Smith Problem.
Answer:
The 5 bags of pretzels.
Step-by-step explanation:
Because if you were to buy 5 individual bags you would end up paying $20.00, instead of $12.00
Easy,
split them up,
-4(-11+4n)=
=44-16n
then
-3(-2n+9)=
=6n-27
Making it, 44-16n+6n-27, add your apples and oranges
-16n+6n=-10n
44-27=17
-10n+17.
Thus, this is your answer.
