21 chaperones are needed for 420 students.
Step-by-step explanation:
No. of juniors = 148
No. of seniors = 272
Total = 148+272 = 420 students
3 chaperones = 60 students
1 chaperone = 
Ratio of chaperon to students = 1:20
Let,
x be the number of chaperons for 420 students.
Ration of chaperones to students = x:420
Using proportion
Ratio of chaperones to students :: Ratio of chaperons to students

Product of mean = Product of extreme

Dividing both sides by 20

21 chaperones are needed for 420 students.
Keywords: ratio, proportion
Learn more about ratios at:
#LearnwithBrainly
Two whole numbers
plssss mark as brilliant
1. Subtract 6x from both sides so now you have -2y = -6x + 18
2. Divide everything by -2, then you would have y = 3x - 9
3. The equation is now in slope intercept form so the answer is 3.
Answer:
were is the qn?
Step-by-step explanation: