What will be the Natural Number? If
Answer: (4) 10
Let be the number of natural number is X
The average X natural number = 15
The sum of X natural number = 15 x X = 15X
30 is added to first number and 5 is subtracted from the last number.
Then, the sum of X natural number = 15X + 30 – 5 = 15X + 25
Then, average = (15X + 25 ) /X = 17.5
= 15X + 25 = 17.5X
2.5X = 25
X = 10
Hence, the number of natural number is 10.