The present ratio of students to teachers at a certain school is 30 to 1. If the number of students were to increase by 50 and that of teachers were to increase by 5, the ratio of students to teachers would then be 25 to 1. What is the present number of teachers?
Solution
Correct Answer: Option D
মনে করি,
চাত্র সংখ্যা=30x
শিক্ষক সংখ্যা =x
প্রশ্নমতে, 30x + 50 : x+5 = 25: 1
⇒30x + 50 /x+5 = 25/1
⇒30x + 50 =25x + 125
⇒ 5x = 75
⇒ x = 15
চাত্র সংখ্যা=30x
শিক্ষক সংখ্যা =x
প্রশ্নমতে, 30x + 50 : x+5 = 25: 1
⇒30x + 50 /x+5 = 25/1
⇒30x + 50 =25x + 125
⇒ 5x = 75
⇒ x = 15
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