How to process array of hashes in a better way

Below is the array of hashes from the PGResult set.

result = [
 {"type" => 1 , "original" => "true",   "count" => "10"},
 {"type" => 1 , "original" => "false",  "count" => "20"},
 {"type" => 2 , "original" => "false",  "count" => "30"},
 {"type" => 2 , "original" => "true",   "count" => "40"},
 {"type" => 3 , "original" => "true",   "count" => "50"},
 {"type" => 3 , "original" => "false",  "count" => "60"}
]

I want to process the above array of hashes to the below format. total_count = count of original("true") - count of original("false") for each type!

result = [
 {
    "type" => 1, "total_count" => "10",
    "type" => 2, "total_count" => "10",
    "type" => 3, "total_count" => "-10",
}

]

any hint to process the above array ?