Q85 of 113 Page 110

The sum of three consecutive odd natural numbers is 69. Find the prime number out of these numbers.

Let the 3 consecutive odd numbers be x,x + 2,x + 4

According to the question


x + x + 2 + x + 4 = 69


3x + 6 = 69


3x = 69-6


3x = 63


x = 21


(divide by 3 on both the sides)


The numbers are x = 21


x + 2 = 21 + 2 = 23


x + 4 = 21 + 4 = 25


Among 21,23 and 25 it is found that 23 is a prime number


∴Prime number = 23


More from this chapter

All 113 →
83

Karstubh had 60 flowers. He offered some flowers in a temple and found that the ratio of the number of remaining flowers to that of flowers in the beginning is 3:5. Find the number of flowers offered by him in the temple.

 84

The sum of three consecutive even natural numbers is 48. Find the greatest of these numbers.

 86

The sum of three consecutive numbers is 156. Find the number which is a multiple of 13 out of these numbers.

 87

Find a number whose fifth part increased by 30 is equal to its fourth part decreased by 30