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kvv77 [185]
4 years ago
9

A math class is made up of 20 boys; the rest are girls. Eighty percent of the class is boys. How many students are in the math c

lass?
Mathematics
2 answers:
bekas [8.4K]4 years ago
5 0
Solve this problem by setting up a proportion to model the number of boys to the total number of students than the class:
80/100=20/x

Now, cross multiply:
80x=2000

Then, divide 2000 by 80 to solve for x:
x=25

25 is the total number students in the class.

Hope this help
kupik [55]4 years ago
4 0
Part- 20
Percent- 80%
Whole- ?


For 80 to get to 20 we can divide by 4

20 80
-— = -—
100
Whatever we do to the top we do to the bottom!
So we can divide 100 by 4 as well. That is 25. 20
-—
25
There are 25 students in the class.
That’s how I learned.
Hope it helped!
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3 years ago
A baker uses 131 2 cups of flour to make key lime bread. She uses 21 4 cups of flour to make each loaf. The baker sells 2 3 of t
elena-14-01-66 [18.8K]

Answer:

She sells 4 loaves of key lime bread

Step-by-step explanation:

Extracting the key information from the question:

*** A baker uses 13 1/2 cups of flour to make key lime bread

*** She uses 2 1/4 cups to make each loaf.

*** She sells 2/3 of the loaves of bread that she makes.

Now, since she uses 2 1/4 to make each loaf, we will convert this into improper fraction.

2 1/4 = [(4×2)+1]/4 = 9/4

She uses a total of 13 1/2 cups of flour to make all loaves.

To find the number of loaves she makes, we will divide the overall quantity of flour used by the quantity used to make a loaf

13 1/2 ÷ 2 1/4

Since 13 1/2 and 2 1/4 are the same as 27/2 and 9/4 respectively (mixed to improper fractions), we will then divide 27/2 by 9/4

= 27/2 × 4/9 = 6 loaves (total bread she makes).

Again, we learnt she sells 2/3 of the total loaves she makes.

Since total = 6, then 2/3 of 6 is:

2/3 × 6 = 4 loaves .

Therefore, the baker sells 4 loaves of key lime bread.

5 0
3 years ago
Read 2 more answers
How To work this out ?
MrMuchimi
(a) Using the completing the square method, we need to write  into the form of  where , so
Expand to find the value of c
Notice that we get back the first two terms, the  and the .We need to get rid of the last term of '9' as the term was not in the original form. The final form will look like
Hence, 
(b)          
(c) , square root both sides      plus and minus of 2     Hence           
 
6 0
3 years ago
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