kasey1292
03.12.2019 •
Mathematics
Steven has 9 gold coins that are identical in appearance. however, one coin is counterfeit and weighs slightly less than the others. using a balance scale, how can he find the counterfeit coin in just two weighings?
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Ответ:
Split the coins into three groups, A, B and C consisting of 3 coins in each group.
Weigh: A--B
1. If A=B, the the counterfeit is in group C
Weigh any two coins in group C and figure out the rest.
2. If A≠B, then the counterfeit is in the lighter group.
Weigh any two coins in the lighter group and figure out the rest.
Ответ:
14.4%
L*W*H=V=10*9*4.5=405 in^3.
that is 50.5 in^3 over the estimate, or 14.4%