Question

the geometric mean of two positive number is 10 . By including the third number ,the geometric mean becomes 8 . what is third number??​

Answer 1

Answer:

5.12

Step-by-step explanation:

let a,b,c be the three numbers

GM of a and b is 10

I.e ab^1/2=10

ab=100

also abc^1/3=8

abc=512

therefore c=5.12