References
- 1Cambridge Dictionary, on the back of an envelope
dictionary.cambridge.org
- 2Wiktionary, back-of-the-envelope
en.wiktionary.org
- 3Wikipedia, Back-of-the-envelope calculation
en.wikipedia.org
1/3
Back of the envelope. It became a date.
Forty teams, a day each, one engineer: eight weeks. The meeting trimmed it to four and called it a plan. 123
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