I've this hash

```
{
    19132=>{
        :occurences=>34,
        :name=>"bar"
    },
    19133=>{
        :occurences=>19,
        :name=>"foo"
    }
}

```

I would like to find the addition of occurrences (34+19) in a new key (why not `total`) on each key (19132 and 19133).

I've something like:

```
my_hash = {19132=>{:occurences=>34, :name=>"bar"}, 19133=>{:occurences=>19, :name=>"foo"}}
my_hash.values.inject{|memo, el| memo.merge(el){|k, old_v, new_v| old_v + new_v if k.is_a?(Numeric)}}

```

I've found some help [Here](https://stackoverflow.com/questions/4453511/ruby-group-hashes-by-keys-and-sum-the-values) but I'm stuck with the merge. I don't even know if this method can solve my problem.