Wouldent the answer be A because all percents are out of 100 so the 1.9 would be 9 over 100
12 students/1 teacher = 276 students/x teachers
Students are on top of the ratio and teachers are on the bottom of the ratio. It must remain the same on both sides of the equation.
12 x = 276
divide by 12
x =23
Answer:
The sum of ages of all 18 pupils in the class = 81
Step-by-step explanation:
Total number of pupil in the class = 18
Average of years in the class = 
Now, 
⇒Average of sum of ages in the class = 4.05
Let us assume the sum of ages of all students in the class = m
By the formula for AVERAGE:
or, m = 18 x 4.5 = 81
Hence, the sum of ages of all 18 pupils in the class = 81
I was really scared when I first looked at this ... I thought it was gonna
keep going to infinity, and I don't know how to handle those.
But this fraction only has 2 or 3 levels to it, so I think we can do it without
too much trouble.
The secret is: You definitely have to start at the bottom and work
your way up.
-- See the bottom level ? It's 2 + 1/3 .
-- Change that number all to an improper fraction, and it's 7/3 .
The reason I want to do that is because it's the denominator of the
next fraction up, and that fraction is (1 over it).
-- The denominator of the next fraction up is 7/3, so 1 over it is just 3/7.
-- Now, before we go up to the top level, it looks like we're supposed to
add the big black ' 1 ' to where we are now ... to the 3/7 .
' 1 ' = 7/7 . Add that to the 3/7, and we have 10/7 .
All we have left now, out of the whole pile, is (1 over 10/7).
And that's just <em>7/10</em>.
Answer:
i think its B cause 4 was the radius
Step-by-step explanation:
