The rule of fifths is similar to the rule of thirds.    From Wordnik.com.  [Archive 2006-03-01] Reference

Two fifths of the uninsured are between 18 and 35.    From Wordnik.com.  [Myths Of The Uninsured] Reference

Now, four fifths of Americans live in metropolitan areas.    From Wordnik.com.  [The Spirit Of America] Reference

In August about two fifths of banks were still tightening.    From Wordnik.com.  [Companies Are Maxed Out Too] Reference

More than two-fifths of visits represented non-emergencies.    From Wordnik.com.  [A Cost-Control Mirage] Reference

Nearly four fifths of the sexually active population uses condoms.    From Wordnik.com.  [The Great Viagra Emergency] Reference

Between 1930 and 1933, two fifths of the nation's 23,679 banks failed.    From Wordnik.com.  [A Slow Fix For The Banks] Reference

Two fifths of the uninsured are young (19 to 34) and relatively healthy.    From Wordnik.com.  [Getting Real About Health Care] Reference

There are men lined up humming perfect thirds and fifths in the toilets.    From Wordnik.com.  [The secret of barbershop: harmonise, project – and smile!] Reference

After working at it for six years, he is now three fifths of the way there.    From Wordnik.com.  [Waiting For The Jukebox] Reference

They live on three-fifths of China's land, but they are not ethnically Chinese.    From Wordnik.com.  [Delicacies From 'Beyond The Great Wall'] Reference

Four-fifths said their supervisors support a balance between work and family life.    From Wordnik.com.  [Survey shows OPM workers dissatisfied with opportunities for career advancement] Reference

Two fifths are from Europe; Japan sends more (2.9 million) than any other country. 9.    From Wordnik.com.  [Here's Some Good News, America] Reference

"Actually, at this time of the year it's more like my better three-fifths," Bob said.    From Wordnik.com.  [My Drifter Doppelganger] Reference

Federal officials disagree, estimating that four-fifths of the oil rose to the surface.    From Wordnik.com.  [Scientists report undersea oil plume stretching 21 miles from BP spill site] Reference

By the time the wheels actually turn, four fifths of the original energy has disappeared.    From Wordnik.com.  [Spin Your Wheels, For Less] Reference

Under one CBO projection, that increases almost two fifths, to 24.5 percent of GDP, by 2030.    From Wordnik.com.  [OUR KIDS WILL PAY THE BILL] Reference

China is said to make four-fifths of the world's toys and almost three-fifths of its clothing.    From Wordnik.com.  [China overtakes Japan as world's second-largest economy] Reference

High-wage countries provide most of our imports; Japan and Canada alone supply nearly two fifths.    From Wordnik.com.  [The Great Fog Over Nafta] Reference

But for the three fifths of the world's people who live in Asia, the prognosis is especially dire.    From Wordnik.com.  [BEWARE OF FALLING ICE] Reference

In private hospitals, where two fifths of babies are born, the rate soared to 52.8 percent in 1999.    From Wordnik.com.  [The New Latin Labor] Reference

Tuition revenue covers only one fifth of the budget at public colleges and two fifths at private ones.    From Wordnik.com.  [What To Chop] Reference

Before the war (and excluding the Great Depression), recessions occupied about two fifths of the time.    From Wordnik.com.  [How Our American Dream Unraveled] Reference

Then there was a Constitution that never used that word but counted black bodies as three-fifths of a man.    From Wordnik.com.  [‘Hope on a Tightrope’] Reference

Recent debt reductions have reversed two fifths of the increase, bringing debt burdens back to late-1987 levels.    From Wordnik.com.  [The Recovery Is Coming] Reference

Of the roughly 30 percent that responded, Du Pont judged that two fifths might not correct their problems in time.    From Wordnik.com.  [Self-Inflicted Cyber Wound?] Reference

They would also allow lawmakers to bend the balancing rules in emergencies with a three-fifths vote in each house.    From Wordnik.com.  [Making The Buck Stop There] Reference

Oil makes up four fifths of your exports, and maintaining high prices is clearly important to your economic policy.    From Wordnik.com.  ['We Can Be Different'] Reference

The Mister Wong brand hasn't yet caught fire outside Germany, which accounts for four fifths of its 3 million users.    From Wordnik.com.  [Creating Buzz (Without Hate Mail)] Reference

(In grassroots surveys, as many as three-fifths of Taiwanese citizens want the pandas, and many others don't object.).    From Wordnik.com.  [Panda Politics] Reference

It pays two fifths of all costs and subsidizes private insurance by excluding employer-paid benefits from income taxes.    From Wordnik.com.  [Health Care: The 'Con' That Failed] Reference

Today's filibusters no longer feature the "Mr. Smith Goes to Washington" theatrics and cloture now requires three fifths.    From Wordnik.com.  [Let’s Get Ready To Reconcile!] Reference

Among the top 1 percent, report Saez and Piketty, more than four-fifths of income comes from salaries and self-employment.    From Wordnik.com.  [The Rich and the Rest] Reference

Four fifths of the world's energy comes from fossil fuels: oil (35 percent), coal (25 percent) and natural gas (20 percent).    From Wordnik.com.  [A Darker Future For Us] Reference

About two-fifths of the increase would come from China and India; other developing countries would account for much of the rest.    From Wordnik.com.  [$100 a Barrel] Reference

About four fifths of big U.S. firms also resort more to bonuses, personal incentives and stock options, reports Hewitt Associates.    From Wordnik.com.  [Anxiety Amid The Prosperity] Reference

He needs to enlist at least half of Congress to rewrite ordinary laws, and three fifths (in four separate votes) to amend the Constitution.    From Wordnik.com.  [So Who Runs Brazil?] Reference