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rewona [7]
2 years ago
13

QUESTION 10

Mathematics
2 answers:
VARVARA [1.3K]2 years ago
4 0

Answer:

  • See below

Step-by-step explanation:

Let the first test score is x, then the next two are x - 10 and x - 20 and the total of three is 258.

<u>We can reflect this as:</u>

  • x + x - 10 + x - 20 = 258

<u>Solving we get:</u>

  • 3x - 30 = 258
  • 3x = 258 + 30
  • 3x = 288
  • x = 288/3
  • x = 96

<u>The scores are:</u> 96, 86 and 76

alexandr402 [8]2 years ago
3 0

Answer:

let the grade points be a,b,c

a+b+c=258

b=c+10( since she noticed that on tests two and three,she scored 10 points fewer).

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