Question
If the weight of 7 books is 120 lbs. Weight of 28 books is ________.
- 500
- 510
- 520
- 480
Hint:
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
The correct answer is: 480
Here, it is given that the weight of 7 books is 120 lbs. We have to find the weight of 28 books.
Weight of 7 books = 120 lbs.
Weight of 1 book = 120/7.
Weight of 28 books = 120⁄7 × 28 = 480 lbs.
Hence, the correct option is D.
We can find the weight by 28 books by multiplying the weight of 7 books by 4.
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