davenportram Posted October 8, 2012 Share Posted October 8, 2012 I have 9 tins that appear identical. One is ever so slightly heavier than the rest. I have a set of balance scales to use to find the tin that is heavier. What is the smallest number of times I need to use the scales to find it? Link to comment Share on other sites More sharing options...
Boycie Posted October 8, 2012 Share Posted October 8, 2012 3 Link to comment Share on other sites More sharing options...
Day Posted October 8, 2012 Share Posted October 8, 2012 0, use your hands and guess Link to comment Share on other sites More sharing options...
davenportram Posted October 8, 2012 Author Share Posted October 8, 2012 Keep trying! I need an explanation so I can award method marks Link to comment Share on other sites More sharing options...
ladyram Posted October 8, 2012 Share Posted October 8, 2012 I know it, fookin ell I know it!!! But I forgot what Dav said when he told me. 'http://www.dcfcfans.co.uk/public/style_emoticons/<#EMO_DIR#>/wacko' class='bbc_emoticon' alt=':wacko:' /> Link to comment Share on other sites More sharing options...
davenportram Posted October 8, 2012 Author Share Posted October 8, 2012 0, use your hands and guess Your the annoying one that says "don't get it" without trying aren't you Link to comment Share on other sites More sharing options...
Boycie Posted October 8, 2012 Share Posted October 8, 2012 weight then all, divide by 9, weight half, check your total, etc etc. next. Link to comment Share on other sites More sharing options...
davenportram Posted October 8, 2012 Author Share Posted October 8, 2012 It's a balance scale - surely you remember them - you put tins in each side and the heavy side goes down (no one if the tins isn't a witch so you can't burn it and they won't float) Link to comment Share on other sites More sharing options...
Day Posted October 8, 2012 Share Posted October 8, 2012 Your the annoying one that says "don't get it" without trying aren't you I would counter your question and ask how do you know one is ever so slightly heavier? Link to comment Share on other sites More sharing options...
davenportram Posted October 8, 2012 Author Share Posted October 8, 2012 weight then all, divide by 9, weight half, check your total, etc etc. next. How can you weigh 4.5 tins Link to comment Share on other sites More sharing options...
Boycie Posted October 8, 2012 Share Posted October 8, 2012 obviously, re reading that post by me makes it sound totally wrong. i worded it wrong,and when the answer comes to light, you'll see what I actually meant. Link to comment Share on other sites More sharing options...
CumbrianRam Posted October 8, 2012 Share Posted October 8, 2012 9 tins, try tin 1, compare with tins 2-9, tin 2 compare to tins 3-9 etc. Link to comment Share on other sites More sharing options...
davenportram Posted October 8, 2012 Author Share Posted October 8, 2012 I would counter your question and ask how do you know one is ever so slightly heavier? Because au put an extra Lego brick in it when I set up the question - next. Link to comment Share on other sites More sharing options...
DCFCfranco Posted October 8, 2012 Share Posted October 8, 2012 x+x=5 what is x? Link to comment Share on other sites More sharing options...
Boycie Posted October 8, 2012 Share Posted October 8, 2012 How can you weigh 4.5 tins i have a 18v angle grinder on my truck. Link to comment Share on other sites More sharing options...
davenportram Posted October 8, 2012 Author Share Posted October 8, 2012 9 tins, try tin 1, compare with tins 2-9, tin 2 compare to tins 3-9 etc. Good start but why compare 1 tin at a time? Link to comment Share on other sites More sharing options...
ladyram Posted October 8, 2012 Share Posted October 8, 2012 It's maths. I don't give a shiny ***** what the answer is. Link to comment Share on other sites More sharing options...
davenportram Posted October 8, 2012 Author Share Posted October 8, 2012 i have a 18v angle grinder on my truck. Angle grinders are banned in classrooms Link to comment Share on other sites More sharing options...
CumbrianRam Posted October 8, 2012 Share Posted October 8, 2012 9+8+7+6+5+4+3+2 = 44 Link to comment Share on other sites More sharing options...
DCFCfranco Posted October 8, 2012 Share Posted October 8, 2012 Btw dav give me some surds to do we're doing at the moment in a-level so could do with more practice. Link to comment Share on other sites More sharing options...
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