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Discover LudwigThe phrase "by a fifth" is grammatically correct and can be used in written English.
It is typically used to describe a percentage or amount that is one fifth of something. For example: - "The company's profits increased by a fifth this quarter." - "The recipe calls for reducing the sugar by a fifth." - "We were able to reduce our expenses by a fifth through cost-cutting measures."
Exact(60)
Tax receipts have fallen by a fifth.
Production was slashed by a fifth.
His rival's shares soared by a fifth.
They are bound together by a fifth C: the customer.
Its overseas oil production climbed by a fifth.
Private consumption has dropped by a fifth since 2008.
Ford's net income dropped by a fifth, to $1.3 billion.
Now they may be joined by a fifth.
Fees may rise by a fifth, to over $10,000.
"Ultrasupercritical" generation can cut CO2 emissions by a fifth.
Unacceptable, said Thistle.Thistle's share price immediately fell by a fifth.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com