A city has 5 new houses for every 9 old houses. If there are 35 new houses in the city, how many old houses are there?
1 answer:
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You want to do to one side the same thing you do to the other side.
In order to get the n by itself you divide the 25n by 25. But in order to not change the answer you need to do the same to the 70.
so n=
which can be reduced to 
so n=
In order to get the n by itself you divide the 25n by 25. But in order to not change the answer you need to do the same to the 70.
so n=
so n=
