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September 3, 2014

September 3, 2014

Posted by **Linda** on Wednesday, January 25, 2012 at 8:28am.

How do I figure this?

- math -
**Reiny**, Wednesday, January 25, 2012 at 9:36am1920/12 = 160

1920/8 = 240

Can you do anything with that?

- math -
**Linda**, Wednesday, January 25, 2012 at 9:55amstill confused! do they want to know how many items were checked by BOTH john and calvin, meaning the same item?

- math -
**Reiny**, Wednesday, January 25, 2012 at 10:18amJohn checks items

#8 #16 #24 #32 #40 .... #1920

the 8 means he checks item #8 , not 8 items

so isn't the above just like the times table for 8 ?

how many entries are there to get to 1920 ?

that would be 1920/8 or 160

So John had to check 160 items and that last item would be item # 1920.

Use the same argument for Colin.

So John checked 160 items and Colin checked 240 items

So number of items checked by BOTH John AND Colin = 400

(I assumed that they were not looking at the same items, if they are checking the same line , then we have to subtract all common items from the total.

A slightly more difficult question, but ...

what numbers would be divisible by both 8 and 24 ? )

- math -
**Linda**, Wednesday, January 25, 2012 at 10:48amIts a multible choice question and the choices are 20,40,60,80 and I still don't see how to come up with any of these answers

- Correction -math -
**Reiny**, Wednesday, January 25, 2012 at 12:23pmYou are right, I should have taken the intersection of the two sets, I mis-read the question

so we are looking for numbers which are both divisible by 8 and by 12

the smallest of these would be the LCM of 8 and 12 which is 24

so the 24th is checked by both, the 48th is checked by both, etc

then 1920/24 = 80

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