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gl test 6, q 18, help please

Posted: Sun Aug 18, 2013 11:36 am
by goldenstar
It takes 324 kilograms of coal to run a 100-watt light bulb 24 hours a day for a year.
That's equal to the weight of three baby elephants!


How many UK 100-watt light bulbs could you run for 12 hours a day with 12 baby elephants' weight of coal?

answer is 8

Re: gl test 6, q 18, help please

Posted: Sun Aug 18, 2013 12:01 pm
by mystery
Well it is 4 times as much coal, and half as much time, so that is why it is 8 bulbs.

Re: gl test 6, q 18, help please

Posted: Tue Aug 20, 2013 12:55 am
by goldenstar
Thank you very much.