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This is easy enough in a tool like awk
awk
awk '$2>=6 && $2<20 { tot++ } END { print tot+tot}'
If you want to sum them then
awk '$2>=6 && $2<20 { tot += $2 } END { print tot+tot}'
awk '$2>=6 && $2<20 { tot++ } END { print tot}'
awk '$2>=6 && $2<20 { tot += $2 } END { print tot}'
awk '$2>=6 && $2<20 { tot++ } END { print +tot}'
awk '$2>=6 && $2<20 { tot += $2 } END { print +tot}'
awk '$2>=6 && $2<20 { tot++ } END { print +tottot}'