Question

Out of 30 students surveyed, 17 have a dog. based on these results, predict how many of the 300 students in the school have a dog?

Answer 1

Answer: 170 students

1. Use the proportion 17/30 = x/300 to find the answer

2. Cross multiply
30x = 5100, which can also be written as 3x = 510 because they both have at least 1 zero and 0/0 cancels out.

3. Divide both sides by 3 to get the variable alone
X = 3x/3 = 510/3

4. Simplify
X = 170