(3x - 2y) : (x + 3y) = 5 : 6 হলে, (2x + 5y) : (3x + 4y) নির্ণয় করো । Madhyamik 2019


\(\cfrac{3x-2y}{x+3y}=\cfrac{5}{6}\)
বা, \(6(3x-2y)=5(x+3y)\)
বা, \(18x-12y=5x+15y\)
বা, \(18x-5x=15y+12y\)
বা, \(13x=27y\)
বা, \(\cfrac{x}{y}=\cfrac{27}{13}\)
বা, \(x:y=27:13\)
ধরি, \(x=27k\) এবং \(y=13k [k\ne 0]\)
\(\therefore (2x-5y): (3x+4y) \)
\(=(2\times 27k-5\times 13k):(3\times 27k +4\times 13k)\)
\(=(54k-65k):(81k +52k)\)
\(=-11k:133k\)
\(=-11:133\)

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