Question

A magazine as states that 4 out of 7 dentists prefer flash toothpaste.If 1400 dentists were surveyed, how many dentists recommended Flash toothpaste

Answer 1

800 dentists recommended Flash toothpaste

Solution:

Given that, magazine as states that 4 out of 7 dentists prefer flash toothpaste

1400 dentists were surveyed

To find: Number of dentists recommended falsh toothpaste

Let "x" be the number of dentists recommended falsh toothpaste

Then, we can say,

4 out of 7 equals x out of 1400

$\rightarrow \frac{4}{7} = x \times 1400\\\\\rightarrow x = \frac{4}{7} \times 1400\\\\\rightarrow x = 800$

Thus 800 dentists recommended Flash toothpaste