Question

the sum of three consecutive odd number is 21 find the numbers

Answer 1

Let the three consecutive odd number be x,x + 2,x + 4.

Given that the sum of 3 consecutive odd numbers is 21.

x + x + 2 + x + 4 = 21

3x + 6 = 21

3x = 21 - 6

3x = 15

x = 15/3

x = 5.

x + 2 = 5 + 2

         = 7

x + 4 = 5 + 4

         = 9.


Therefore the numbers are 5,7,9.

Verification:

5 + 7 + 9 = 21

21 = 21.


Hope this helps!

Answer 2

let 1st no. be x+1
2nd no. = x+3
3rd no. = x+5
acc.
(x+1)+(x+3)+(x+5)=21
3x+9=21
3x=21-9
3x=12
x=12/3
x=4
hence,
1st no. = (x+1)=(4+1)=5
2nd no. =(x+3)=(4+3)=7
3rd no. =(x+5)=(4+5)=9
thus ... nos. are 5,7,9

hope it helps u