Please, please help me!
2 answers:
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Answer:
240
Step-by-step explanation:
Given that each book on a certain shelf is labeled by a single category. For every 2 history books, there are 7 fantasy books and for every 3 fantasy books, there are 5 reference books
Let history, fantasy and reference books be x,y,z
Then x:y =2:7, y:z = 3:5
Or x:y:z =6:21:35
Now when we double x:y we get
x:y = 4:7 while y:z=3:5
we get
x:y:z = 12:21:35
Original fantasy books =
New fantasy books =
Difference = 0.3387-0.3088
=0.299
Approxly 3 is differene equivalent to 60
So new X =