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Answer :

Xjxccaxgo

Answer:

45 old houses

Step-by-step explanation:

new houses : old houses

3 : 9

15 : ?

(3 = 1st ratio and 9 = 2nd ratio)

To find the missing ratio, divide the first ratio from the new ratio:

15 / 3 = 5

Take the product and multiply that by the second ratio to find the missing ratio:

9 x 5 = 45

Conleyjuliannego

Answer:

45 old houses

Step-by-step explanation:

What I did:

I divided 15 by 3, to get an idea of the 'scale' which gives us 5

for every 9 old houses, we have 3 new ones; so to scale be multiply the base number by our "scale" number, 5.

3 * 5 = 15 new houses

8 * 5 = 45 old houses

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