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If $$\frac{4a-5b}{4a+5b}=\frac{1}{6}$$ ,then a : b = ?
7 : 4
4 : 7
3 : 7
7 : 3
None of these
$$\frac{4a-5b}{4a+5b}=\frac{1}{6}$$
$$6\times(4a-5b) = 1\times(4a+5b)$$
24a-30b = 4a+5b
24a-4a = 30b+5b
20a = 35b
4a = 7b
a/b = 7/4
a:b = 7:4
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