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Study Stuff for MCA Examinations - NIMCET
Study Stuff for MCA Examinations - NIMCET
Previous Year Question (PYQs)
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: $\boxed{65}$ ✅
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