Shira has 20 books on her bookshelf. Of those 15 are about horses, the rest are nature books. What fraction of Shiras books are
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Answer:
Step-by-step explanation:
Let X be the amount of money that Laurie has to spend.
Let Y be the amount of money that Laurie's sister has to spend.
Let C be the cost of a box of chocolates.
The following represents how much money Laurie and her sister have after buying the box of chocolates:
X + Y - C
This result is the amount of money that Laurie and her sister have left to buy on flowers.
Let F be the amount of money that Laurie and her sister spend on flowers.
We know that the above result must be greater than or equal to the amount that Laurie and her sister spend on flowers; otherwise they will be spending more than they have.
The following equation then represents how much Laurie and her sister have left to spend on flowers:
X + Y - C F
Plugging in the values for the above letters will give you your answer.