در ادا 2 = c , a (a + b) : b 5 (b +...
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در ادا 2 = c , a (a + b) : b 5 (b + c) = ? (1) 3:4 (2) 5 :9 (3) 4:5 (4) 20 : 27

11th - 12th Class
Maths
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110
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48. ( (4) a: b=2: 3 ) ( begin{aligned} & b: c=4: 5 therefore a: b: c &=2 times 4: 3 times 4: 3 times 5 =& 8: 12: 15 therefore frac{a+b}{b+c} &=frac{8+12}{12+15}=frac{20}{27} end{aligned} )
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