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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 [tex]x[/tex].
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 = [tex]\frac{4}{7}[/tex].
And, [tex]x[/tex] equivalent to 1400 =[tex]\frac{x}{1400}[/tex].
Thus, we set the proportion and solve by cross multiplication method:
[tex]\frac{4}{7} =\frac{x}{1400}[/tex]
By cross multiplying we get:
[tex]5600=7x[/tex]
Dividing both sides by 7 we get:
[tex]800=x[/tex]
[tex]x=800.[/tex]
Therefore, the number of doctors recommended flash toothpaste 800.
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 = [tex]\frac{1400}{7}[/tex] = 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 = [tex]4\times 200[/tex]= 800
