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stiks02 [169]
2 years ago
9

Solve mentally. See the image below.

Mathematics
2 answers:
Nana76 [90]2 years ago
8 0

Answer:

7.5 is <u>37.5%</u> of 20.

Step-by-step explanation:

Solve for %

We know that ; % = given no. ÷ total no. × 100

Where, we've

  • Given number = 7.5
  • and Total number = 20

plug the values

\small \sf \frac{7.5}{20} \times 100 \\

canceling 100 by 20 to get

7.5 × 5

multiply the numbers

37. 5 %

Sholpan [36]2 years ago
7 0
37.5% of 20 is 7.5 so the answer is 37.5%
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9. The ticket at right has a perimeter of 42 cm.
Liula [17]

Perimeter simply represents the sum of all side lengths of a shape. The length of the missing side of the ticket is 5 cm; the length of gold line on each ticket is 20 cm, and 2 bottles of gold ink are required to draw gold lines on 200 tickets.

I've added the image of the ticket as an attachment.

(a) The missing side length

From the attachment, the 4 unknown side lengths are equal. Represent this side length with L.

So, we have:

Perimeter =2\times 11 + 4 \times L

This gives

2\times11 + 4 \times L = 42

22 + 4 \times L = 42

Collect like terms

4 \times L = 42-22

4 \times L = 20

Divide both sides by 4

L =5cm

(b) The length of the gold lines

There are 4 slant lines and the length of one of the slant lines is 5 cm (as calculated above).

So, the length of the gold line is:

Gold = 4 \times L

Gold = 4 \times 5cm

Gold = 20cm

(c) The number of gold ink bottles.

n = 200 --- number of tickets

The length of all gold line in the 200 tickets is:

Length = 200 \times Gold

Length = 200 \times 20cm

Length = 4000 cm

Length = 4000 \times 0.01m ---- convert to meters

Length = 40m

Given that:

Bottle = 20m --- 1 bottle for 20 m

The number of bottles (n) is:

n = \frac{Length}{Bottles}

n = \frac{40m}{20m}

n = 2

Hence, 2 bottles of gold ink are enough.

Read more about perimeters at:

brainly.com/question/6465134

4 0
2 years ago
Round 12.5478 to the nearest hundredths
solong [7]

Answer:

12.04

Step-by-step explanation:

Find the number in the hundredth place  4  and look one place to the right for the rounding digit  1 . Round up if this number is greater than or equal to  5  and round down if it is less than  5 .

6 0
3 years ago
Simplify the following expression.
son4ous [18]

Answer:

C. log 9

Step-by-step explanation:

Hope this helped!

6 0
3 years ago
2. C is at (-5.1) &amp; D is at (7.6). Where is the midpoint on segment CD?​
topjm [15]

Answer:

1.25

Step-by-step explanation:

Find the average.

-5.1+7.6=2.5

2.5/2

1.25

6 0
3 years ago
How many centimeters are in 6.8 meters?
sesenic [268]

Answer:

680 cm

Step-by-step explanation:

There are 100 cm in 1 m, so multiply 6.8*10, which equals 680

hope this helps :)

7 0
3 years ago
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