Answer: 3 Sets of the 4 post cards and 3 of the single post cart sets.
Step-by-step explanation:
You buy 3 of the 4 post card set becuase that is the most you can get of those to get under 15 post cards.
You would now have 12 postcards now you have to buy 3 of the single set to get to 15 cards
4 because 4 times 24 equals 96 then 96 divided by 3 equals 32
4.5 to 6.5 i think not really shure
Answer
Find out how much money did she start with.
To proof
let us assume that the money she had be x.
As given
woman spent two thirds of her money

Money she had after spent two thirds of her money = Total money - money spent


As given she lost two thirds the remainder


we get

Money she had after lost two thirds the remainder = Money she had after spent two thirds of her money - she lost two thirds the remainder


As given
she had $4 left
thus

x = $36
she start with $36.
Hence proved