The present ratio of students to teachers at a certain school is 30 to 1. If the student enrollment were to increase by 50 students and the number 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?
বিকল্পসমূহ (নিজের উত্তর যাচাই করতে ক্লিক করুন):
সঠিক উত্তর
3 (15)
বিস্তারিত ব্যাখ্যা ও বিশ্লেষণ:
Solution:
Let,
The number of students is 30x
The number of teachers is x
ATQ,
(30x + 50)/(x + 5) = 25/1
⇒ 30x + 50 = 25x + 125
⇒ 30x - 25x = 125 - 50
⇒ 5x = 75
∴ x = 15
∴ The present number of teachers is 15
