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kolezko [41]
3 years ago
8

Marissa got an 85% on her math quiz. If she got 34 questions right, how many questions were on the test?

Mathematics
2 answers:
irinina [24]3 years ago
6 0
40

34÷85×100=40

Hope it helps
zaharov [31]3 years ago
4 0
To solve this problem we need to determine if 85% is 34, then what is 100%

The easiest way to do this is to set up a proportion 

Being \frac{34}{85}       \frac{x}{100}

To figure out the "rule" between 85 and 100, we divide 100 by 85.

100/85 = 20/17

To check our rule we can do 85 x 20/17 which = 100 

Now to solve the problem so, 34 x 20/17 = 40

Our answer would be 40 :)

If Marissa got an 85% on her math quiz and she got 34 questions right, there would be a total of 40 questions on the test.

I hope this helps!
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Step-by-step explanation:

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What is the solution to the system of equations?
s344n2d4d5 [400]

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(3,2)

Step-by-step explanation:

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Read 2 more answers
How did the temperature change if: at first it decreased by 60% and then increased by 80%. PLEASE NEED HELP!
Sergio039 [100]

The temperature decreased by 28%

Step-by-step explanation:

How did the temperature change if :

  • At first it decreased by 60%
  • Then increased by 80%

Assume that the temperature before decreasing is 100%

∵ The temperature before decreasing = 100%

∵ It decreased by 60%

→  Before decreasing  :  decreasing  :    after decreasing

→  100%                         :  60%              :    100% - 60% = 40%

∴ The temperature after decreasing = 40%

Assume that the temperature after decreasing is 100%

∵ The temperature after decreasing = 100%

∵ It increased by 80%

By using the ratio method

→  After decreasing  :  increasing  :    after increasing

→  100%                      :  80%             :   100% + 80% = 180%

→  40%                        :                       :   x%

By using cross multiplication

∴ 100% × x% = 40% × 180%

- Divide both sides by 100%

∴ x% = \frac{(40)(180)}{100}

∴ x% = 72%

∵ At first the temperature = 100%

∵ At last the temperature = 72%

∵ The first the temperature > the last the temperature

∴ The decreasing in temperature = 100% - 72% = 28%

The temperature decreased by 28%

Learn more:

You can learn more about ratio in brainly.com/question/2707032

#LearnwithBrainly

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