Question

A television commercial claims thta 9 out 10 dentists surveyed recommended bliss toothpaste. if 450 of the dentists surveyed recommended bliss, then how many did not recommend it?

Answer 1

The answer is: "50 [of the dentists surveyed]" .
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Note: 9/10 = 0.9 =0.90 = 90/100 = 90%

Let "x" representation total number of dentists surveyed.

90% of "x" = 450

(0.9)x = 450 ;

Multiple EACH SIDE of the equation by "10" ;

9x = 4500 ;

Dived each side of the equation by "9" ;

9x / 9 = 4500/ 9 ;

x = 500 ;

So; 500 dentists total in survey ; 450 out of 500 recommended Bliss ;

The number that did NOT recommend "Bliss" = 500 - 450 = 50 .
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The answer is: "50 [of the dentists surveyed]" .
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Answer 2

Answer: A&C

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