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Delhi University MCA Previous Year Questions (PYQs)
Delhi University MCA Ratio And Proportion PYQ
Delhi University MCA PYQ
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Delhi University MCA Previous Year PYQ Delhi University MCA DU MCA 2019 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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Delhi University MCA Previous Year PYQ Delhi University MCA DU MCA 2019 PYQ
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: $\boxed{65}$ ✅
Delhi University MCA PYQ
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Delhi University MCA Previous Year PYQ Delhi University MCA DU MCA 2019 PYQ
How much of acid is in the 10 liter of a 60% solution, of acid and water solution?
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Delhi University MCA Previous Year PYQ Delhi University MCA DU MCA 2019 PYQ
Solution
Total solution $= 10 \text{ liters}$
Percentage of acid $= 60\%$
⇒ Amount of acid $= \dfrac{60}{100} \times 10 = 6 \text{ liters}$
Answer: $\boxed{6 \text{ liters}}$ ✅
Delhi University MCA
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