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 Post subject: Help with this GL question pleasePosted: Sun Aug 07, 2016 7:28 pm

Joined: Thu Oct 09, 2014 11:12 am
Posts: 87
Please can anyone help..
I can't seem to work this out for dd..
324 kg of coal to run a 100 watt bulb for 24 hours a day for a year
That's equal to the weight of 3 baby elephants

How many 100 watt bulbs could you run for 12 hours a day with 12 baby elephants weight of coal

Thanks

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 Post subject: Re: Help with this GL question pleasePosted: Sun Aug 07, 2016 7:40 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14011
Quote:
[3 baby elephants] of coal to run a 100 watt bulb for 24 hours a day for a year

How many 100 watt bulbs could you run for 12 hours a day with 12 baby elephants weight of coal

OK take it one step at a time - 12 baby elephants would run bulbs for longer so ...

12 baby elephants of coal to run .... 100 watt bulbs for 24 hours a day for a year [assuming the time period is still a year?]

etc.

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 Post subject: Re: Help with this GL question pleasePosted: Sun Aug 07, 2016 8:23 pm

Joined: Wed Mar 04, 2009 2:01 pm
Posts: 7877
Location: Herts
You will do better if you post Maths questions in the Maths section.

There are lots of forum members willing to help.

Mods can you move this to the Maths section pls. DG

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 Post subject: Re: Help with this GL question pleasePosted: Sun Aug 07, 2016 8:43 pm

Joined: Thu Oct 09, 2014 11:12 am
Posts: 87
Ok thank you

Please can it be moved mods

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 Post subject: Re: Help with this GL question pleasePosted: Sun Aug 07, 2016 8:47 pm

Joined: Mon Mar 03, 2014 10:24 pm
Posts: 953
Location: Petts Wood, Bromley, Kent
8

3 into 12 = 4
Then double it as only running bulbs for half as much time.

Or am I over simplifying it and have it completely wrong?

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 Post subject: Re: Help with this GL question pleasePosted: Sun Aug 07, 2016 8:55 pm

Joined: Thu Oct 09, 2014 11:12 am
Posts: 87
Yes answer is 8 but I could not work out how to get there

Thank you

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 Post subject: Re: Help with this GL question pleasePosted: Sun Aug 07, 2016 9:16 pm

Joined: Tue Aug 02, 2016 5:05 pm
Posts: 5
First work out how many 100 watt bulbs you can run for 12 hours every day for a year with 3 baby elephants worth of coal (that's double the number of 100 watt bulbs you are able to run for 24 hours using the same 3 baby elephants - I.e. 2 x 1 = 2 bulbs).

Then work out how many 100 watt bulbs you can run for 12 hours every day for a year with four times as much coal (as 12 baby elephants is 4 times 3 baby elephants). I.e.

2 bulbs x 4 = 8.

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 Post subject: Re: Help with this GL question pleasePosted: Sun Aug 07, 2016 9:21 pm

Joined: Thu Oct 09, 2014 11:12 am
Posts: 87
Thanks

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 Post subject: Re: Help with this GL question pleasePosted: Tue Aug 23, 2016 11:59 am

Joined: Thu Sep 25, 2014 10:06 am
Posts: 22
just showed it to dd -
she says
3e -24 hrs for-1y
12e-24hrs for 12/3=4y
thus 12e-12 hrs =4x2=8y

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