how can i make a string with an integer in bash?

It could be simplified just to

awk -F: '{sumA+=$1; sumB+=$2} END {printf "%s\n%s\n", sumA, sumB}' random.txt

From the manual:

$ man awk

...
-F fs
--field-separator fs
    Use fs for the input field separator (the value of the FS predefined variable).
...

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