Math Is Fun Forum

juantheron

Member

Registered: 2011-10-19

Posts: 312

chocklet

In a small sweet shop people usually buy either one cake or one box of chocolate ,One day the shop sold 57 cakes and 36 boxes of chocolate,How many customers were there that day if 12 people bought both a cake and a box of chocolate

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: chocklet

Hi juantheron;

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: chocklet

hi bobbym

yup,me too.

hi juantheron

this is best done by set logic,especially if you use a Venn's diagram.

using that kind of diagram we can devise a formula:

where |A| denotes the number of elements in A (or the so called cardinality of A)

Last edited by anonimnystefy (2012-01-14 01:17:37)

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

juantheron

Member

Registered: 2011-10-19

Posts: 312

Re: chocklet

Thanks bobbym and anonimnystefy

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: chocklet

Hello juan;

You are welcome, do you see how the answer was derived?

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.