In a bookstore ,60 identical books occupy a length of 1.5m on a shelf.Find the number of such books needed to completely occupy a shelf that is 80 cm long.
wrong ans
To find the number of identical books needed to completely occupy a shelf, we can set up a proportion using the given information.
Let's assume that the number of books needed to completely occupy a shelf of length 80cm is represented by 'x'.
According to the given information, 60 identical books occupy a length of 1.5m (which is the same as 150cm). So, we can set up the following proportion:
60 books / 150cm = x books / 80cm
To solve this proportion, we can cross-multiply and solve for 'x':
60 * 80 = 150 * x
4800 = 150x
Dividing both sides by 150:
4800 / 150 = x
32 = x
Therefore, you would need 32 identical books to completely occupy a shelf that is 80cm long.
Wrong answer
average width of a book = 150/60 cm = ....
then number of books for 80 cm = 80/width of book
or
just use a simple ratio
n/80 = 60/150 , solve for n , the number of books