The weight of 72 books is 9kg. (a) find the weight of 80 such books. (b) how many books will weigh 6kg?
Answers
9kg=9000gm
weight of 1 book=9000/72=125gm
weight of 80 books=80×125=10000gm=10kg
in 60 kg there will be 6000/125 =50
Given,
The total weight of 72 books = 9 Kg
To find,
a) The total weight of 80 such books.
b) Number of books that will weigh 6 Kgs.
Solution,
We can simply solve this mathematical problem using the following process:
Mathematically, by using the unitary method, we get;
The total weight of 72 books = 9 Kg
=> the weight of each book = (9/72) Kg
=> the total weight of 80 such books = (9/72 × 80) Kg = 10 Kgs
Now,
Total number of books that will weigh 9 Kgs = 72
=> number of books that will weigh 1 Kg = (72/9) = 8
=> total number of books that will weigh 6 Kgs= 6×8 books = 48 books
Hence, the total weight of 80 such books is equal to 10 Kgs, and the total number of books that will weigh 6 Kgs is equal to 48.