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If 15 notebooks cost ₹240, then how many notebooks can be bought with ₹992?
62
64
60
66
62
Calculate the price per notebook: 240/15=16. Then divide total amount by 16: 992/16=62.
Cost of 15 notebooks = ₹240, Total amount available = ₹992.
N=Cost of QtyTotal Amount×Qty
Calculate the price per notebook: 240/15=16. Then divide total amount by 16: 992/16=62.
Many students try to set up the ratio incorrectly as 240/992=15/x, which is correct but prone to simplification errors compared to finding the unit price first.
Calculate the cost of one notebook
Divide the total cost of the notebooks by the quantity to find the unit price: 240/15.
Costunit=15240=16
Apply unit price to total amount
Divide the total amount of ₹992 by the unit price of ₹16 to find the total number of notebooks.
N=16992
Final division
Perform the division: 992/16=62.
N=62
A is correct because dividing the total amount ₹992 by the unit cost of ₹16 results in 62 notebooks.
The unitary method is the foundation for solving problems on speed-distance-time and profit-loss where ratios remain constant.
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