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Cost of 1 notebook=Rs. \frac{31}{4}
⇒For Rs \frac{31}{4} 1 notebook can be purchased
⇒For Re.1 ,1 / \frac{31}{4} notebooks can be purchased
⇒For Rs. \frac{279}{4}  \frac{4}{31} * \frac{279}{4} notebooks can be purchased
⇒ 7 notebooks.
Ans:7 notebooks can be purchased for Rs. 69 3/4.
Note:The mixed fractions are converted into Improper fractions within the sum.
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