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Miko and Keddy shared 210 stamps in the ratio 2 : 5. How many more stamps did Keddy have?

 Feb 1, 2020
 #1
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\(M : K\)  \( : M+K\)

\(2 \)    \(:\) \(5\)    \(: 7\)

 

They have 210 so

\(M:K:210 \)

\(2 : 5 : 7\)

"How many stamps did Keddy have?"

Keddy, K is 5*210/7 =150 stamps 

 Feb 1, 2020
 #2
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....and  

 

Miko has    2/7  * 210 = 60 stamps

 

So K  has    150-60 = 90 MORE stamps than M

 

 

 

 

 

Another way      total stamps = 210

    K has   (5-2)/7 = 3/7   more stamps     3/7 x 210 = 90 more stamps

 Feb 1, 2020

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