Maybe, with + 19 + 1 in A1...

=SUM((TRIM(MID(SUBSTITUTE(A1,"+",REPT(" ",255)),1+(ROW(A1:A200)-1)*255,255)) & "0")/10)

IMPORTANT

• This is an array formula
• Enter the formula >> press F2 then >> CTRL + SHIFT + ENTER
• If entered correctly, the formula will be enclosed in {brackets}
• Do not enter the {brackets} manually