Aspire Faculty ID #5716 · Topic: DU MCA 2019 · Just now
DU MCA 2019

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?

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: $\boxed{65}$ ✅

Previous 10 Questions — DU MCA 2019

Nearest first

Next 10 Questions — DU MCA 2019

Ascending by ID
Ask Your Question or Put Your Review.

loading...