Question

The overall age of X and Y is 12 year which is greater than the overall age of Y and Z. Z is how many decades younger than X???

Answer 1

Answer:

Z is 1.2 decades younger than X

Explanation:

The overall age of X and Y is 12 years which is greater than the overall age of Y and Z. Now, Z is how many decades younger than X???

Let say over all age of X  & Y  = A

& Overall age of Y & Z = B

now the overall age of X and Y is 12 years greater than the overall age of Y and Z

=> A  = 12 + B

=> X + Y = 12 + Y + Z

=> X = 12 + Z

=> X - Z  = 12

Z is  12 year younger than X

=> 12/10 = 1.2   ( 1 decade = 10 years)

=> Z is 1.2 decades younger than X

Answer 2

Z is 1.2 decades more energetic than X  

All around requested elucidation:  

The general time of X and Y is 12 years which is more essential than the general time of Y and Z. By and by, Z is to what extent more energetic than X???  

Let say over all time of X  & Y  = A  

furthermore, Overall time of Y and Z = B  

directly the general time of X and Y is 12 years more significant than the general time of Y and Z  

=> A  = 12 + B  

=> X + Y = 12 + Y + Z  

=> X = 12 + Z  

=> X - Z  = 12  

Z is the methods by which multi year more young than X  

=> 12/10 = 1.2  

=> Z is 1.2 decades more young than X