The Student Room Group

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Reply 1
list out the numbers if you have to
Reply 2
7 * 3 * 4 = 84
itsalec
list out the numbers if you have to

Probably how I would do it as its quicker than finding the LCM
Reply 4
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Reply 5
84, (i think)

LCM
Reply 6
12*7 = 84
21*4 = 84

Lcm
Reply 7
Mr Toad croaks at:
21,42,63,84 seconds

Polly Parrot squarks at:
12,24,36,48,60,72,84 seconds

Ans: 84 seconds...presuming they both make noise at 0 seconds, but i took that to be true because you aren't told otherwise
Reply 8
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Reply 9
Yeah its the lowest common multiple of both of them aka, the lowest multiple that they both share.
Reply 10
Homage
Mr Toad croaks at:
21,42,63,84 seconds

Polly Parrot squarks at:
12,24,36,48,60,72,84 seconds

Ans: 84 seconds...presuming they both make noise at 0 seconds, but i took that to be true because you aren't told otherwise

wow if thats right your amazing hehe ... which it probably is
Reply 11
i miss the good ol' days of simple gcse maths... :smile:
Reply 12
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Reply 13
My bad... didnt read that bit!
Reply 14
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Reply 15
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Yeah. Although I think that's what the 'next' in the question is for.
Glutamic Acid
Yeah. Although I think that's what the 'next' in the question is for.


Glutamic, I think you have misunderstood his reply...

Try reading all the posts again :wink:
Reply 18
84 is indeed the corret answer

I am always right
Reply 19
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