-
The sum of five consecutive odd numbers is equal to 175. What is the sum of the second largest number and the square of the smallest number among them together?
-
- 989
- 997
- 979
- 995
- None of the above
Correct Option: E
Method 1 to solve this question.
Let p be the first odd number.
Then next odd number is p + 2.
According to question,
Sum of five consecutive odd numbers 175
⇒ p + p + 2 + p + 4 + p + 6 + p + 8 = 175
⇒ 5p + 20 = 175
⇒ p = (175 - 20)/5 = 31
According to question,
Sum of the second largest and square of smallest one = (31 + 6) + (31)2
Sum of the second largest and square of smallest one = 37 + 961 = 998
Method 2 to solve this question.
Let p be the even number.
Then next odd number is p + 1. so on p + 3 , p + 5................ P + 9
According to question,
Sum of five consecutive odd numbers 175
⇒ p + 1 + p + 3 + p + 5 + p + 7 + p + 9 = 175
⇒ 5p + 25 = 175
⇒ p = (175 - 25)/5
⇒ p = (150)/5
⇒ p = 30
First odd number = p + 1 = 30 + 1 = 31
According to question,
Sum of the second largest and square of smallest one = (30 + 7) + (30 + 1)2
Sum of the second largest and square of smallest one = 37 + 961 = 998