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Question
If P :Q =3:2 , P : R= 2: 7 , then what is the value of Q : R?
3 : 7
2 :7
4 : 21
4 : 9
3 : 5
ANSWER : 3
Descrption
<p>Q : P = 2 : 3 = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mn>2</mn><mo>&#xD7;</mo><mn>2</mn><mo>:</mo><mn>3</mn><mo>&#xD7;</mo><mn>2</mn></math> = 4 : 6<br /> P : R = 2 : 7 = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mn>2</mn><mo>&#xD7;</mo><mn>3</mn><mo>:</mo><mn>3</mn><mo>&#xD7;</mo><mn>3</mn></math> = 6 : 21<br /> <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo></math> Q : P : R = 4 : 6 : 21<br /> So, Q : R = 4 : 21</p>
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