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marin [14]
3 years ago
14

70 POINTS!! AND BRAINLIEST HELPPPPP!!!

Mathematics
2 answers:
DerKrebs [107]3 years ago
6 0

Answer:

  1. 3000 girls
  2. 38 fishes
  3. 37 points
  4. 115 marbles
  5. 19 gray coloured cars

Step-by-step explanation:

Let the unknown values be x

1.

30 class mates = 1 class room

18 girls in 1 classroom

18 girls in 30 classmates

x girls in 5000 class mates

18\:girls= 30\:students\\x\:girls = 5000\:students\\\\Cross\:Multiply\\\\30x = 90000\\\\Divide\:both\:sides\:by\:30\\\frac{30x}{30} = \frac{90000}{30}\\ \\x = 3000\\= 3000 girls

2.

2.5\:miles = 12 \:fishes\\8\:miles = x\:fishes\\\\Cross\:Multiply\\2.5x = 96\\\\Divide\:both\:sides\:of\:the\:equation\:by\:2.5\\\\\frac{2.5x}{2.5}=\frac{96}{2.5}\\  \\x = 38.4\\Approximately \: =38\:fishes

3.

8\:minutes = 14\: points\\21 \:minutes = x \:points\\\\Cross\:Multiply\\8x = 294\\\\\mathrm{Divide\:both\:sides\:by\:}8\\\frac{8x}{8}=\frac{294}{8}\\\\Simplify\\x=\frac{147}{4}\\\\x = 36.75\\\\Approximately\:= 37\:points

4.

32\:marbles = 5\:inches\\x\:marbles = 18\:inches\\\\Cross\:Multiply\\5x = 576\\\\\mathrm{Divide\:both\:sides\:by\:}5\\\frac{5x}{5}=\frac{576}{5}\\\\x=\frac{576}{5}\\\\x =115.2\\= 115=\:marbles

5.

2 \: gray\:colour= 15\:cars\\x\:gray= 140\:cars\\\\Cross\:Multiply\\\\15x = 280\\\\\mathrm{Divide\:both\:sides\:by\:}15\\\frac{15x}{15}=\frac{280}{15}\\\\Simplify\\x=\frac{56}{3}\\\\x =18.666\\Approximately ;\\19

const2013 [10]3 years ago
6 0

Answer:

4.  300 girls

5.  38 fish

6.  36 points

7.  115 marbles

8.  18 gray colored cars

Step-by-step explanation:

4.

<u>  30 </u> = <u> 500 </u>

18G       x

30x = 500 (18)

x = 300 girls

---------------------------------

5.

<u>2.5 mils </u>  =  <u> 8 miles </u>  

12 fish              x

2.5x = 8 (12)

x = 96/2.5

x = 38 fish

---------------------------------

6.

<u>  8 mins </u>   =   <u> 21 mins</u>

14 points            x

8x = 21 (14)

x = 294/8

x = 36 points

---------------------------------

7.

<u>32 marbles  </u> =    <u>         x         </u>

 5 inches             18 inches

5x = 32 (18)

x = 576 / 5

x = 115 marbles

---------------------------------

8.

<u>140 cars </u> =  <u> 15 cars  </u>

    x              2 gray

15x = 140 (2)

x = 280 / 15

x = 18 gray colored cars

---------------------------------

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