Question

the mean of three numbers is 7 the mean of first two numbers is 6 find the third number

Answer 1

Answer:

the third number is 9.

Step-by-step explanation:

let x,yand z be three no. respectively

according to given conditions

x+ y+ z. =7. (1) And. x+y =6

3. 2

x+y =6×2=12. (2)

put (2)in(1)

12+z/3=7.

12+z=7×3=21

z=21-12=9

hence ,the third number is 9.