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aniked [119]
2 years ago
14

Gina checked 20 markers. 7 of them were working. What percent of her markers were not working?​

Mathematics
2 answers:
Dmitrij [34]2 years ago
5 0

Answer:

65%

Step-by-step explanation:

HOPE THIS HELPS

PLZZ MARK BRAINLIEST

BaLLatris [955]2 years ago
4 0
65% of her markers were not working
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The sum of three numbers is 26. Twice the first minus the second is the third less 2. The third is the second minus 3 times the
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Let a, b, c represent the three numbers. The problem statement gives rise to three equations:

  • a +b +c = 26
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Adding the first two equations gives

... (a +b +c) +(2a -b) = (26) +(c -2)

... 3a +c = 24 +c . . . . . simplify

... 3a = 24 . . . . . . . . . . subtract c

... a = 8 . . . . . . . . . . . . divide by 3

Adding the second and third equations gives ...

... (2a -b) +(-3a +b) = (c -2) +(c)

... -a = 2c -2 . . . . simplify

... -6 = 2c . . . . . . add 2, substitute for a

... -3 = c . . . . . . . . divide by 2

Using the third equation we can find b.

... -3·8 +b = -3 . . . . substitute for a and c

... b = 21 . . . . . . . . .add 24

The numbers are 8, 21, -3.

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The method above is sort of "ad hoc", taking advantage of the numbers in this particular set of equations. You can use more formal methods of Gaussian elimination or Cramer's Rule to solve these by just following a procedure. Or, your graphing calculator can do it for you.

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Step-by-step explanation:

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