if a/b = 2/5 , then 2a²/ 3b²
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Step-by-step explanation:
a<b As C is +ve
∴ac<bc & lly ca<cb
ba=52⇒b=21a
than 7a+5b2a+3b=7a+5×25a2a+3×25a=39a19a=3919
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Answered by
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