7. The term dates... to the 19th ... when in ... and ... most of... days were bank holidays,... is, days on were to closed.

Ответ

The term dates back to the 19th century when in 1871 and 1875 most of these days were bank holidays, that is, days on which were to be closed.

Перевод

Этот термин восходит к 19 веку, когда в 1871 и 1875 годах большинство этих дней были банковскими праздниками, то есть днями, в которые должны были быть закрыты.