poppet2 Posted March 5, 2012 Share Posted March 5, 2012 This is a sum for primary school children which millions of Adults couldn't get right. Can you? You have 3 parcels Parcels A and B together weigh the same as parcel C The three parcels weigh 800gms altogether Parcel A weighs 250gms How much does parcel C weigh? ................................ Link to comment Share on other sites More sharing options...
steve68 Posted March 5, 2012 Share Posted March 5, 2012 400gms...................... Link to comment Share on other sites More sharing options...
hyper Posted March 5, 2012 Share Posted March 5, 2012 so C is half the weight of the total of 800 = 400 why do we need the weight of A? or am I missing something? This si the sort of problem displayed at my lad's secondary school, so i don't know why they say its for primary school. Primary school for Oxbridge potentials perhaps? Might have been more sensionalist if they said it was for mums & baby's classes Link to comment Share on other sites More sharing options...
rubydazzler Posted March 5, 2012 Share Posted March 5, 2012 400gms......................That can't be right, can it? Because I would have said that as well, and I'm rubbish at maths. And if millions of adults can't get it right, why would we two be any different? No, it must be more complicated than that. Link to comment Share on other sites More sharing options...
barleycorn Posted March 5, 2012 Share Posted March 5, 2012 A + B = C and A = 250 so... (1) B - C = -250 A + B + C = 800 and A = 250 so... (2) B + C = 550 (2) - (1) B + C = 550 B - C = -250 - 2C = 800 C = 400 B = 150 jb Link to comment Share on other sites More sharing options...
truman Posted March 5, 2012 Share Posted March 5, 2012 A+B+C=800 A+B=C so C+C=800 C=400 Why do we need to know how much A weighs? Link to comment Share on other sites More sharing options...
barleycorn Posted March 5, 2012 Share Posted March 5, 2012 A+B+C=800 A+B=C so C+C=800 C=400 Why do we need to know how much A weighs? So that you can waste your doing doing it the long way like I did. D'oh. jb Link to comment Share on other sites More sharing options...
steve68 Posted March 5, 2012 Share Posted March 5, 2012 A+B+C=800 A+B=C so C+C=800 C=400 Why do we need to know how much A weighs? You don't in my day you wouldn't have it would have been..... You have 3 parcels Parcels A and B together weigh the same as parcel C The three parcels weigh 800gms altogether How much does parcel C weigh? even then we would have p'd ourselves at how easy that was:hihi: Link to comment Share on other sites More sharing options...
splodgeyAl Posted March 5, 2012 Share Posted March 5, 2012 A+B+C=800 A+B=C so C+C=800 C=400 Why do we need to know how much A weighs? So that you can waste your doing doing it the long way like I did. D'oh. jb Indeed. Or maybe the problem with these so-called "elementary maths problems that adults can't do" is that the question is badly written that it confuses people? Link to comment Share on other sites More sharing options...
alchresearch Posted March 5, 2012 Share Posted March 5, 2012 Indeed. Or maybe the problem with these so-called "elementary maths problems that adults can't do" is that the question is badly written that it confuses people? I agree, the weight of parcel A clouded things a little for me. It's a meaningless fact in the equation, but I started to wonder if parcels A and B are the same size and weight. Link to comment Share on other sites More sharing options...
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