(720) रुपये में कुछ कॉपियाँ खरीदी गईं। यदि प्रत्येक कॉपी (6) रुपये सस्ती हो जाए तो (4) कॉपियाँ अधिक मिलती हैं। मूल प्रति कॉपी मूल्य क्या था?
Some notebooks are bought for (720) rupees. If each notebook becomes (6) rupees cheaper, (4) more notebooks can be bought. What was the original price per notebook?
Explanation opens after your attempt
C. (36) रुपये(36) rupees
Concept
If the original price is (x), then \(\frac{720}{x-6}-\frac{720}{x}=4\). This gives (x=36).
Why this answer is correct
The correct answer is C. (36) रुपये / (36) rupees. If the original price is (x), then \(\frac{720}{x-6}-\frac{720}{x}=4\). This gives (x=36).
Exam Tip
मूल मूल्य (x) हो तो \(\frac{720}{x-6}-\frac{720}{x}=4\)। इससे (x=36) मिलता है।
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