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Delhi University MCA Previous Year Questions (PYQs)
Delhi University MCA Ratio And Proportion PYQ
Average of ten numbers in a list is 25.If one of the numbers in the list is exchanged with another number the average of the new list increases by 5. What is the new number included in the list , if the original number was 15?
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Solution
Given:
- Average of 10 numbers = 25
- One number (15) is replaced with another number (x)
- New average becomes 30
✅ Step 1: Original total = 10 × 25 = 250
✅ Step 2: New total = 10 × 30 = 300
✅ Step 3: Difference = 300 − 250 = 50
✅ Step 4: New number − Old number = 50
⇒ x − 15 = 50 → x = 65
Final Answer: The new number included in the list is 65.
How much of acid is in the 10 liter of a 60% solution, of acid and water solution?
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Solution
Delhi University MCA
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