Question

the sum of five consecutive odd number is 85. find the number.

Answer 1

Let the first no. be = x

thus five numbers are x,x+1,x+2,x+3,x+4

Sum = x+x+1+x+2+x+3+x+4=85

so 5x + 10 =85

> 5x=75

>x=15

no. are 15,16,17,18,19

Answer 2

Answer:

let the five consecutive odd natual no.

$x(x + 2) .(x + 4).(x + 6).(x + 8)$

$x + x + 2 + x + 4 + x + 6 + x + 8 = 85$

$= 5x + 20 = 85 = 5x = 85 - 20$

$= 5x = 65$

$x = 13$

hece the required no. are 13

$(13 + 2) = 15..(13 + 4) = 17.(13 + 6) = 19.(13 + 8) = 21$