6. dan is watching the birds in his backyard. of the birds he watches, 9 of them, or 45%, are sparrows. how…

6. dan is watching the birds in his backyard. of the birds he watches, 9 of them, or 45%, are sparrows. how may birds are in his backyard?

6. dan is watching the birds in his backyard. of the birds he watches, 9 of them, or 45%, are sparrows. how may birds are in his backyard?

Answer

Explanation:

Step1: Set up the proportion

Let the total number of birds be (x). We know that (45%=\frac{45}{100}), and the number of sparrows is (9). So the proportion is (\frac{9}{x}=\frac{45}{100}).

Step2: Cross - multiply

Cross - multiplying gives us (45x = 9\times100).

Step3: Solve for (x)

First, calculate (9\times100 = 900). Then, (x=\frac{900}{45}).

Answer:

(20)