freinds please solve this question
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a:b = 2:5
2a + 3b÷ 7a + 5a
b ( 2 a÷b + 3 )÷ b ( 7 a÷b + 5 )
(2× 2 ÷5 +3 ) ÷ (7× 2÷5 + 5 )
(4÷5+3) ÷( 4÷5 +5 ) =
19
39
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