英语 example sentences with "back-of-the-envelope"

Doing some quick back-of-the-envelope calculations, he reckoned that the raw materials actually cost less than one-thirtieth of the selling price.
Translate from 英语 to 西班牙语

We can do some back-of-the-envelope calculations before all the facts come in.
Translate from 英语 to 西班牙语