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finlep [7]
3 years ago
15

There are 18 girls in mr.brimleys class. If 60 percent of the students are girls how many students are in mr.brimley’s math clas

s?
Mathematics
1 answer:
emmainna [20.7K]3 years ago
8 0

Answer:

30 students in the class.

Step-by-step explanation:

There are several which in which we can approach this question:

We can do this question using direct proportion.

"If 18 girls represent 60%, how many students represent 100%?"

18

60

=

x

100

x

=

18

×

100

60

30

students altogether.

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Answer:

If a = b, then a - c = b - c

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Alex skateboards at a constant speed from his house to school 3.8 miles away. It takes him 18 minutes. What fraction represents
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. . . or simply

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8 0
3 years ago
The gas tank of a 2013 Honda Accord holds 17.2 gallons. How many pounds of carbon dioxide are produced by burning an entire tank
cricket20 [7]
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8 0
2 years ago
In △ABC, AD and BE are the angle bisectors of ∠A and ∠B and DE ║ AB . Find the length of DE if perimeter of ABDE is 30 cm and AB
-BARSIC- [3]

Answer:

DE = 6 cm

Step-by-step explanation:

Let DE = x cm.

Since DE is parallel to AB therefore by the alternate interior angles theorem, m∠BAD = m∠ADE and m∠ABE = m∠DEB ............(1)

As AD is an angle bisector of ∠A, therefore m∠EAD = m∠DAB ; Since BE is an angle bisector of ∠B ⇒ m∠ABE = m∠EBD.

Therefore, from (1) We get ,  m∠EAD = m∠ADE and m∠EBD = m∠BED.

So, the triangles ADE and EDB are then isosceles with AE = ED and ED = DB.

So AE = DE = DB = x, and since the perimeter of ABDE is 30 cm, then

12 + x + x + x = 30

⇒ 12 + 3x = 30

⇒ x = 6

Hence, the length of DE is 6 cm.


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2 years ago
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