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sammy [17]
3 years ago
9

In a class the ratio of number of boys to the number of girls is 4:5. If the number of girls is 20, find the number of boy ??

Mathematics
2 answers:
Charra [1.4K]3 years ago
6 0

Answer:

25

Step-by-step explanation:

The answer is 25 because if the ratio is 4:5 and there are 20 girls that means they multiplied 4 times 5 to get 20 and that means you have to do the same to the ratio of boy and when you multiply 5 times 5 you get 25

yarga [219]3 years ago
3 0

Answer:

Let x and y be the no. of boys and girls in the class.

Then,

x/y = 4/5

=> 20/y = 4/5 [Given that x = no. of boys = 20]

=> 4y = 20×5

=> 4y = 100

=> y = 100/4

=> y = 25

Therefore the no. of girls in the class is 25

Step-by-step explanation:

Also can u pls mark me brainliest im new

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2 years ago
Rita started the day with r apps then she deleted 5 apps and still had twice as many apps as Cora has .write and an equation tha
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Answer:

r - 5 = 2c

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Step-by-step explanation:

To write an equation for the problem, we first need do declare the value of the number of apps cora has.

Let c = Cora's apps

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r - 5 is used to indicate that Rita deleted 5 apps.

2c is used to represent the twice the number of apps Cora has.

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3 years ago
Becky bought a new Apple computer for $1,205. The purchase price included a 6% sales tax. What's the actual selling price of the
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Answer:

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Step-by-step explanation:

In this example, we want to learn what the original price of the computer would be if the price is $1,205, and this includes a 6% sales tax. This means that this price is 106% of the original price (100% is the price, while 6% is the tax). Therefore:

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What is the inverse of the function f(x) = 2x + 1? h(x) = 1/2x - 1/2
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Answer:

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Step-by-step explanation:

Here's the procedure for finding the inverse function algebraically:

1.  Replace the label 'f(x)' with the label 'y:'  y = 2x + 1

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3 years ago
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