Delhi University MCA Ratio And Proportion Previous Year Questions (PYQs)
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Showing 2 questions
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
Average of 10 numbers $= 25$
⇒ Sum of 10 numbers $= 10 \times 25 = 250$
New average $= 25 + 5 = 30$
⇒ New sum $= 10 \times 30 = 300$
Increase in sum $= 300 - 250 = 50$
Let the new number be $x$.
Then $x - 15 = 50$
⇒ $x = 65$
Answer: $\boxed{65}$ ✅
How much of acid is in the 10 liter of a 60% solution, of acid and water solution?
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Solution
Total solution $= 10 \text{ liters}$
Percentage of acid $= 60\%$
⇒ Amount of acid $= \dfrac{60}{100} \times 10 = 6 \text{ liters}$
Answer: $\boxed{6 \text{ liters}}$ ✅
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