(283+a)/5>70

Question

What do i need to score in my 5 exam to pass the class with at least a 70 if already have a 58, 74, 70 and 81?

Answer 1

 58 + 74 + 70 + 81 + x
----------------------------  ≥ 70
               5  

 283 + x
-----------  ≥ 70
      5

283 + x ≥ 5 * 70 

283 + x ≥ 350

x ≥ 350 - 283

x ≥ 67
Your score should be at least 67

Answer 2

Hi Marlene;

(283+a)/5>70

I hope you understand this symbol, >.  When I was in the sixth grade, the way we remembered this is, The alligator is going to eat the bigger one.

I understand that the results of the first four exams are...

58+74+70+81=283

The fifth result must keep your average above 70.

(70)(5)=350

350-283=67

a>67