Question: A school wants to keep the ratio of students to teachers at 18:1 , If the number of students increases by 15% next year , how many additional teachers must be hired if the school currently has 36 teachers?
A) 3
B) 5
C) 6
D) 9
Correct answer: C
Grade: 7 | Topic: Ratios and proportions | Difficulty: Hard | Standard: 7.RP.A.2