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Why is my answer not correct?

(62 Posts)
Ruprekt Wed 30-Oct-13 10:02:05

24 pirates.

1/3 found gold

1/4 found rubies

1/2 found neither

How many found gold and rubies?

My calc was 8 found gold, 6 found rubies, 12 found nothing.

So, 14 found gold and rubies.....but 14 + 12 = 26........


I love literacy but maths aint my thing.......confusedconfusedconfused

Please help......

Ruprekt Wed 30-Oct-13 10:07:17


Seeline Wed 30-Oct-13 10:11:21

I came up with the same as you.... and I've got an A level (although that was a very long time ago grin) I got one of DDs Y5 maths questions wrong hte other day too blush

Ahardyfool Wed 30-Oct-13 10:12:18

DS and I think there is a typo!

Ruprekt Wed 30-Oct-13 10:12:34

Lol Seeline! I need the correct answer though!

I think I am reading it there a small fraction that found gold AND rubies?

cece Wed 30-Oct-13 10:13:19

wouldn't it be 8? If only 8 had gold then no more than that can have gold and rubies? << hopeful >>

DrownedGirl Wed 30-Oct-13 10:13:49

Some of those who found gold also found rubies
That's the number you are looking for

There are only 12 who could have found gold or rubies

Where is the overlap

answers Wed 30-Oct-13 10:14:09

Not all of them who found gold found rubies as well smile

cece Wed 30-Oct-13 10:14:46

or maybe it would be 6?

Ruprekt Wed 30-Oct-13 10:14:52

Ds thinks the answer is 2........

FunnysInLaJardin Wed 30-Oct-13 10:14:58

I think your answer is right and that 2 pirates found both gold and rubies

YDdraigGoch Wed 30-Oct-13 10:15:02

Some of them might have found more than one thing. So the 8 that found gold might also have found rubies.

Ahardyfool Wed 30-Oct-13 10:15:07

I think the small fraction who found both could be the key here... This would make this a riddle more than a legitimate maths question!

pushmepullyou Wed 30-Oct-13 10:16:46

24 pirates

12 found nothing therefore 12 found gold, rubies or both.

If 8 found gold and 6 found rubies then then 2 must have found both or there wouldn't be 12 who had found nothing.

So 6 just gold, 4 just rubies, 2 both =12

Helspopje Wed 30-Oct-13 10:16:55

12 none
6 r
8 g
6+8 = r + g +rg
14 = r + g + rg
rg = 2

MrsMangoBiscuit Wed 30-Oct-13 10:17:22

8 found gold.
6 found rubies.
12 found nothing.

So 12 found SOMETHING.
12 - 8 who found gold = 4 who found ONLY rubies.
6 total rubies - 4 rubies only = 2 gold AND rubies.

Ruprekt Wed 30-Oct-13 10:17:29

I was adding together the pirates that found gold and the pirates that found rubies, not thinking there was a small percentage who found both. smile

IamtheZombie Wed 30-Oct-13 10:17:56

Zombie thinks 2 pirates found both gold and rubies.

8 + 6 = 14 - 2 = 12 + 12 = 24

pushmepullyou Wed 30-Oct-13 10:18:05

X-post with everyone grin

MrsMangoBiscuit Wed 30-Oct-13 10:18:24

Gargh I type too slow one handed, baby DD2, I'm blaming you! grin

AliceinSlumberland Wed 30-Oct-13 10:18:34

The answer is 2 I think,

12 found nothing

8 found gold

6 found rubies


But there are 24 in total so two pirates must have been counted in both the gold category and the rubies category, so they found both:

nothing: 12
Rubies: 4
Both: 2

=24 (I hope)

LordEmsworth Wed 30-Oct-13 10:18:45

well - if 12 found nothing, then 12 found something

14 items were found by 12 pirates - so 2 pirates must have found 2 items each

2 therefore found gold and rubies, 10 found either gold or rubies, plus 12 who found nothing ... equals 24 pirates

IamtheZombie Wed 30-Oct-13 10:18:51


AliceinSlumberland Wed 30-Oct-13 10:18:54

Hahahah too slow!

Ruprekt Wed 30-Oct-13 10:19:02

Do we think the answer is 2 then? gringrin

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