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ser-zykov [4K]
3 years ago
7

If A:B = 5:18 and B:C = 6:4, form the ratio A:B:C​

Mathematics
2 answers:
valina [46]3 years ago
8 0

Answer:

5 : 18 : 12

Step-by-step explanation:

Express the ratio B : C  in fractional form, that is

\frac{B}{C} = \frac{6}{4} ( cross- multiply )

6C = 4B ( divide both sides by 6 )

C = \frac{4}{6} B = \frac{2}{3} B , then

C = \frac{2}{3} × 18 = 2 × 6 = 12

Hence

A : B : C = 5 : 18 : 12

Ede4ka [16]3 years ago
5 0

Answer:

5:18:12

Step-by-step explanation:

5:18

_:6:4 --> since you multiply 6 by 3 to get 18, multiply 4 by three to get the A:B:C ratio.

5:18:12

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The average of 5 quiz grades is 10. When the lowest grade is dropped and the new average is calculated, it turns out to be 11. W
V125BC [204]

Answer:

The score of the dropped grade is 6

Step-by-step explanation:

To find the average of a set of numbers you need to add all the numbers and divide by how many numbers there are. The problem wants you to solve it in reverse. Let put this into an algebraic equation with a, b, c, d, and e being the variables of the test scores

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Then we can multiply both sides by 5 and get

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Doing the same thing, we know that a+b+d+e=44

Now compare the two:

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We can now know that c=50-44=6

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3 years ago
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Veronika [31]

Answer:

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Step-by-step explanation:

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stellarik [79]

Answer:

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Step-by-step explanation:

24/42, 75/135, 150/250, and 75/150 I believe is what you're asking. We know 75/135 is better than 75/150 so 75/150 is out of the equation. If we multiple 75/135 by 2 we get 150/270 which is more than 150/250, so 75/135 is out of the equation. Now to compare 24/42 and 150/250 we can divide their fractions, if we divide 24/42 we get 0.57, so 57%. If we did 150/250 we get 0.6 or 60%. So 150/250 is the best score.

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