SOLUTION: if you had a plate of cookies and you gave 2/3rd away and now only 15 were left, how many cookies were there to start.

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Question 847779: if you had a plate of cookies and you gave 2/3rd away and now only 15 were left, how many cookies were there to start.
Found 2 solutions by rvfer, jim_thompson5910:
Answer by rvfer(117) About Me  (Show Source):
You can put this solution on YOUR website!
15/(1/3)=
15*3/1=45

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
2/3 of 15 = (2/3)*15

2/3 of 15 = (2/3)*(15/1)

2/3 of 15 = (2*15)/(3*1)

2/3 of 15 = 30/3

2/3 of 15 = 10

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Subtract this from 15 to get 15 - 10 = 5

So there are 5 cookies left.