How is going
from

{
  'kim-a' =>['20', '30'], 
  'kate-k' =>['40', '50']
}
[download]

to

{ 'kim-a' =>[25], 'kate-k' =>[45]}
[download]

different from going from

{
  'apple-A'=>[30,40,50,60], 
  'Orange-O'=>[40,20,30,60]
}
[download]

to

{'apple-A'=>[45], 'Orange-O'=>[37.5] }
[download]

?