![I did some back-of-the envelope calculations. Do you know this expression? It means a quick calculation, such as … | American english, English idioms, English study I did some back-of-the envelope calculations. Do you know this expression? It means a quick calculation, such as … | American english, English idioms, English study](https://i.pinimg.com/736x/6f/97/d9/6f97d97ccb0bc929ed7cbd40a5c9ea34.jpg)
I did some back-of-the envelope calculations. Do you know this expression? It means a quick calculation, such as … | American english, English idioms, English study
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![Handwriting text writing We Ll Be Back Soon. Concept meaning Taking a short break out of work coming back in a few Open Envelope with Paper New Email Stock Photo - Alamy Handwriting text writing We Ll Be Back Soon. Concept meaning Taking a short break out of work coming back in a few Open Envelope with Paper New Email Stock Photo - Alamy](https://c8.alamy.com/comp/RAT899/handwriting-text-writing-we-ll-be-back-soon-concept-meaning-taking-a-short-break-out-of-work-coming-back-in-a-few-open-envelope-with-paper-new-email-RAT899.jpg)