Question

A magazine ad states that 4 out of 7 doctors recommend Flash toothpaste. if 1400 doctors were surveyed, how many doctors recommended flash toothpaste?

Answer 1

Answer:

Total number of doctors who recommend Flash toothpaste = 800

Step-by-step explanation:

Give:

Total doctors surveyed = 1400

Out of 7, 4 doctors recommend Flash toothpaste.

To find the total number of doctors who recommend Flash toothpaste.

Solution:

As 4 out of 7 doctors recommend Flash toothpaste, so we will divide the total number of doctors into groups of 7.

Total number of groups formed will be = $\frac{1400}{7}$ = 200

We know that on average 4 doctors in each group recommend Flash toothpaste.

So, to find total number of doctors who recommend Flash toothpaste we will multiply.

Total number of doctors who recommend Flash toothpaste = $4\times 200$= 800

Answer 2

Answer:

The number of doctors recommended flash toothpaste 800.

Step-by-step explanation:

Given:

A magazine ad states that 4 out of 7 doctors recommend Flash toothpaste.

Now, to find the numbers of doctors recommended flash toothpaste if 1400 doctors were surveyed.

Let the number of doctors recommended be $x$.

And the total number of doctors surveyed were 1400.

So, as given 4 out of 7 doctors recommend flash toothpaste.

So, 4 equivalent to 7 = $\frac{4}{7}$.

And, $x$ equivalent to 1400 =$\frac{x}{1400}$.

Thus, we set the proportion and solve by cross multiplication method:

$\frac{4}{7} =\frac{x}{1400}$

By cross multiplying we get:

$5600=7x$

Dividing both sides by 7 we get:

$800=x$

$x=800.$

Therefore, the number of doctors recommended flash toothpaste 800.