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If a : b = 4 : 5 ," find "(5a-b)/(10a+3...

If ` a : b = 4 : 5 ," find "(5a-b)/(10a+3b)`.

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Given, ` a/b = 4/5`
` rArr a = (4b)/5`
`(5a-b)/((10a+3b))=(5((4b)/5) - b)/(10((4b)/5)+3b)=(3b)/(11b) = 3/11`.
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