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bag of money

Maths Week: Monday's puzzle of the day

We’re setting you a little brainteaser each day this week to highlight a drive to improve the country’s numeracy skills.

ENGAGE THOSE BRAINS, folks: we have a teasing question for you.

Each afternoon this week, we’ll be setting you a (not too) tough riddle to get the cogs whirring and test your mathematical mettle.

If this prospect fills you with either a. joy, or b. dread, the mathsweek.ie site is worth a look – with events for maths fans and for those who might feel the need to brush up on their numeracy skills. The events are running from now until Sunday.

Monday’s puzzle:

A cash collection was made around a room with everyone putting a note into a bag. People put in either a €20, a €10 or a €5 note.

I asked the collector how much was in the collection and he told me that if I pulled out a note at random that there would be a 1 in 12 chance of getting a €20 note. He said there would be a 1 in 4 chance of getting a €10 note and a 2 in 3 chance of getting a €5.

I protested that I needed more information. He conceded that four people had put in €20 notes and he refused to tell me any more.

Can you figure out how much money was in the bag?


Poll Results:

€360 (3455)
€280 (835)
€325 (322)
€255 (292)

All answers will be revealed on Friday afternoon. You’ll see what other readers are thinking when you make your choice above and the pie chart shows the most popular option. (We’re not saying that the most popular will be the right one!)

These handy tips will help develop your child’s maths skills (without them knowing it)>

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    Mute Frank Buffets
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    Jun 19th 2011, 11:12 AM

    Go noonan, there is only one way you can satisfy electorate, burn senior bondholders or else loose all respect from us, If you back out.

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    Mute Sue Anthony
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    Jun 19th 2011, 11:26 AM

    He looks like a bull dog chewing a wasp, but I think hes the only one with any guts and backbone in the Government and that he has found his place in Finance. Burn ‘em Michael, look after Ireland before the EU currency! The EU will do everything it can to keep the Euro so tell ‘em we will burn them all, close the banks and open our own new bank not linked to EU based on Irish deposits and then see what they have to say about interet rates and corporation tax – tell ‘em will cut that too if they mention it again !

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    Mute Robert Rigney
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    Jun 19th 2011, 11:39 AM

    Could Ireland being getting a pair of liathroidi. About time.

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    Mute Susan Bell Flavin
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    Jun 19th 2011, 12:15 PM

    Merkle and sarkozi (which my iPhone autocorrects to ‘warlock’ ha!) are so reluctant to burn the bondholders because most of them are French and German. It has everything to do with protecting their own patch and trying to get re-elected, and nothing to do with the good of Europe as a whole. We need to be part of Europe, but the cowtowing and grovelling needs to be over. The bondholders should have to carry their own pain, it was a failed investment. If they could reap the benefits, which they did, they should have to take the burden as well.

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    Mute Martin Haugh
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    Jun 19th 2011, 11:52 AM

    It’s like a poker game out there , and Noonan has the face and the balls to get us a better deal .who else would you send ,(he’s from Limerick )

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    Mute Guinness Follower
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    Jun 19th 2011, 11:46 AM

    Anyone explain how a Greek default would have consequences for Ireland?

    Just wondering.

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    Mute Ann Illing
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    Jun 19th 2011, 3:13 PM

    Putting more debt on top of more debt in Greece is solving nothing………and very bad financial advice…………I hope the people on the streets of Greece win….

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    Mute Mad Gerald
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    Jun 19th 2011, 11:34 AM

    The euro is a cobbled together currency and is doomed to failure,its only function is to keep Merkin and Kermit important in their own minds.

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    Mute Mad Gerald
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    Jun 19th 2011, 12:44 PM

    Several of the newspaper pundits forecast [ some six months ago ?] that the real crunch would come here in June/July when the fight to pay bills got too much and when the money borrowed from family and friends to avoid the shame of not paying the mortgage dried up.I think one writer gave advice on how to stuff the building society and keep the roof over ones head by using the courts ? Will we see this happen in the next few weeks?

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