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If a:(b+c) =1:3 and c:(a + b) =5:7 th...

If a:(b+c) =1:3 and c:(a + b) =5:7 then find (b: a+c)

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`a/(b+c) = 1/3`
`3a = b+c`eqn1
`c/(a+b) = 5/7`
`7c = 5a + 5b`eqn2
`7c= 5a + 5b`
`7c = 5a + 5(3a -c) `
`7c = 5a + 15a -5c`
`12c = 20a`
...
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