In a certain orchestra, each musician plays only one instrument and the ratio of musicians who play either the violin or the viola to musicians who play neither instrument is 5 to 9. If 7 members of the orchestra play the viola and four times as many play the violin, how many play neither?
ক. 63
খ. 35
গ. 28
ঘ. 14
উত্তর: 63
ব্যাখ্যা: Viola + Violin = 5x, Neither = 9x 5x = 7 + 28 = 5x = 35 ⇒x = 7 9x =9⇒7 = 63
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