Challenge 5: 2 Weighing Scales
You can now use 2 weighing scales together at once. It takes 1 minute for a scale to weigh, you will be able to measure faster now using both balances at once.
You have 10 bars now. How much time would you need to find the original gold bar?
What students worked out5
Student 7
2
Student 7
sir isn’t there challenge 6?
Student 3
We can weigh
123 and 456 in first scale
7,8 and 9,10 in second scale
Whichever is heavy you can weigh that group separatelyStudent 3
Like this
Student 1
If we have 2 scales we measure 1,2vs3,4 and 6,7vs8,9 then if equal we weigh 5,10 if 6and7 heavier then we weigh those 2 gold bars like that for whichever gold bars are heavier you measure them. if confusing I can explain in class