Which of the following have a common denominator of 18?

Mathematics

2 answers:

kirill115 [55]4 years ago

4 0

I think its 2 1/2 and 4/9. I'm not 100% sure but I hope it helps.

11111nata11111 [884]4 years ago

3 0

It looks like 2 and a half and 4/9 both have a common denominator of 18, as 2 goes into 18 9 times, and 9 goes into 18 twice.
Hope this helps!

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Answer:

Step-by-step explanation:

You can split the coins into 3 groups, each of them has 3 coins. Weigh group 1 vs group 2, if one is lighter, that group has the fake coin. If both groups weigh the same, then group 3 has the fake coin.

Continue to split the group that has the fake coin into 3 groups, each group has 1 coin. Now apply the same procedure and we can identify the fake coin.

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b) if you have $3^n$ coins then you can apply the same approach and find the fake coin with just n steps. By splitting up to 3 groups each step, after each step you should be able to narrow down your suspected coin by 3 times.