Which rate should be used to solve this problem? a house-building company can build 12 houses in 360 weeks. how long will it take the company to build 7 houses?

If you take the original ratio stated above, 12:360 (12 houses for every 360 weeks) and divide both sides of the ratio you get 1:30 (1 house every 30 weeks). You can take this ratio and multiply both sides by 7 to figure out how long it would take to build 7 houses. The final ratio is 7:210 (7 houses every 210 weeks)

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There are 35 girls in the recycling club

Step-by-step explanation:

4 boys : 7 girls

20 boys : x girls

In order to get to 20, you have to multiply 4 by 5, so multiply 5 to 7 for the girls.

7(5) = 35

There are 35 girls