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Aleonysh [2.5K]
3 years ago
13

If 12 pens cost 3.48 how much do 20 cost

Mathematics
1 answer:
VARVARA [1.3K]3 years ago
7 0

Step-by-step explanation:

12/3.48= cost of 1 book

cost of 20 books = 12/3.48×20 =68.95

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Four CDs and 4 DVDs cost $164. The cost of the 4 CDs is half the cost of the
Andrej [43]

Answer:

$13.67

Step-by-step explanation:

Let's say that CD= c and DVDs= d. Four CDs and 4 DVDs cost $164, so the equation will be:

i.  4c + 4d= 164

The cost of the 4 CDs is half the cost of the  4 DVDs, to put into an equation it will be:

ii.   4c= 0.5(4d)

     4c= 2d

     d= 2c

Then we can substitute the second equation (ii) into the first equation (i). The calculation will be:

4c + 4d= 164

4c + 4(2c)= 164

4c+ 8c= 164

12c= 164

c=13.67

The cost for each CD is $13.67

5 0
3 years ago
The radius of the base of a cylinder is 27 cm and its height is 37 cm. Find the surface area of the cylinder in terms of π
Nonamiya [84]
Surface area of a cylinder = 2 x Pi x r^2 + 2 x Pi x r x h

R = 27 cm
H = 37 cm

Take away the Pi seeing as you want to keep it in terms of Pi

2 x 27^2 + 2 x 27 x 37 = 3456 Pi cm^2
Your answer is B
7 0
3 years ago
Read 2 more answers
(6 × 103) ÷ (3 × 102)
netineya [11]

Answer:

2 or 2.01

Step-by-step explanation:

solve what's in the parenthesis first

(618) / (306)

then divide

2.0196078431

simplified to 2 or 2.01

6 0
3 years ago
What is the volume of the rectangular prism if the length is 3/4 the width is 2/3 and the hight is 1/2
Leno4ka [110]
Multiply it all together 3/4 is 0.75 2/3 is 0.66 1/2 is 0.5 now do in your calculator 0.75+0.66+0.5 and becase everything is in fractions remember that you have to convert your decimal into a fraction your answer is 1 91/100
6 0
4 years ago
Which of the following expressions are equivalent to 8 4/5+(3 2/10-1 1/5
sveticcg [70]
What are the options for this?
7 0
3 years ago
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