Question

The average of three numbers is 10 and that of the first two is 6. Find the third number​

Answer 1

Answer:

x+y+z/3=10

x+y+z=30

x+y=6. given us.

put value of x+y in 2 eq.

so, 6+z=30

z= 24

Answer 2

Answer:

x+6= 10

x= 10-6

x=4

the third no. is 4