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Ilya [14]
3 years ago
14

20% of what number is 18 Explain.

Mathematics
2 answers:
Sophie [7]3 years ago
8 0
In this question, the thing that needs to be found is the number whose 20% would be 18. The information's required for getting to the solution are already provided in the question. based on those given information's, the answer can be deduced very easily.
Let us assume the unknown number to be = x
Then
(20/100) * x = 18
x/5 = 18
x = 18 * 5
   = 90
so the unknown number in the question is 90. I hope the procedure is clear enough for you to understand.
Snowcat [4.5K]3 years ago
7 0
We have a proportion: 18/?= 20/100

Cross multiply:
20*?= 18*100
⇒ ?= 18*100/20= 90

20% of 90 is 18~
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Solve, using the substitution method.
Phoenix [80]
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divide both sides by 2
7-2x=y
subsitute 7-2x for y
7-2x+2x=7
add like terms
7=7
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answer is C
5 0
3 years ago
Read 2 more answers
Each container must hold exactly 1 litre of water Each container must have a minimum surface area
Arada [10]

The containers must be spheres of radius = 6.2cm

<h3>How to minimize the surface area for the containers?</h3>

We know that the shape that minimizes the area for a fixed volume is the sphere.

Here, we want to get spheres of a volume of 1 liter. Where:

1 L = 1000 cm³

And remember that the volume of a sphere of radius R is:

V = \frac{4}{3}*3.14*R^3

Then we must solve:

V = \frac{4}{3}*3.14*R^3 = 1000cm^3\\\\R =\sqrt[3]{  (1000cm^3*\frac{3}{4*3.14} )} = 6.2cm

The containers must be spheres of radius = 6.2cm

If you want to learn more about volume:

brainly.com/question/1972490

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6 0
2 years ago
I need help asap !!!!! 40 POINTS
stira [4]

Answer:

15

Step-by-step explanation:

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4 0
2 years ago
Use an equation to solve. What would it be ABCD? And the sum?
Zepler [3.9K]

Answer:

D. 35 + 145 = x

The sum of the angles = 180 degree

Step-by-step explanation:

35\degree + 145\degree = x\\x=180\degree

6 0
3 years ago
a 10 foot ladder is leaning against the wall. the bottom of the ladder is 4ft from the base of the wall. which of the following
Pie

Answer:

The height of the wall is 9.17ft

Step-by-step explanation:

The length of the ladder is 10ft

Distance from the foot of the ladder to the wall is 4ft

The height of ladder is unknown.

To solve this question, you'll require a pictorial illustration of the situation. Kindly check attached document for that.

Since it's a right angle triangle, we have two sides with one sides unknown, we can use pythagorean theorem to find the third side.

The hypothenus (x) is 10ft

The adjacent is (y) 4 ft

The opposite (z) (height of the wall) is unknown.

X² = Y² + Z²

10² = 4² + Z²

100 = 16 + Z²

Z² = 100 - 16

Z² = 84

Z = √(84)

Z = 9.165 = 9.17ft

The height of the wall is 9.17ft

5 0
3 years ago
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