Question

the sum of five consective numbers is 20 what is the sum of first three consecutive number​

Answer 1

Answer:

9

Step-by-step explanation:

Let the five consecutive numbers be a , a+1 , a+2 , a+3 and  a+4

Their sum = a+a+1+a+2+a+3+a+4 = 20

⇒ 5a + 10 = 20

⇒ 5a = 20 - 10

⇒ 5a = 10

⇒ a = 10/5

⇒ a = 2

The sum of first three consecutive numbers = a + a + 1 + a + 2

= 2 + 2 + 1 + 2 + 2

= 9