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There are 

45

 new houses being built in a neighborhood. Last month, 

2/3

 of them were sold. This month, 

2/5

 of the remaining houses were sold. How many houses are left to be sold? 

Guest Mar 22, 2017
 #1
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Of the 45 houses 2/3 were sold which means that 1/3 were unsold. Therefore we have:

45 x 1/3  =15 houses remained unsold last month.

Of the 15 remaining houses 2/5 were sold which means that 3/5 were unsold. Therefore we have:

15 x 3/5 =45/5 =9 houses left to be sold.

Guest Mar 22, 2017

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