Question

Blair's average on the first five in-class tests is 67. If this is not pulled up to at least a 70,

Answer 1

Answer:

85

Step-by-step explanation:

Average is calculated as

average = $\frac{sum}{count}$

Here

$\frac{sum}{5}$ = 67 ( multiply both sides by 5 )

sum = 335

let x be the mark required to raise average to 70 , then

$\frac{335+x}{6}$ = 70 ( multiply both sides by 6 )

335 + x = 420 ( subtract 335 from both sides )

x = 85

Blair must score at least 85 on his last test

Answer 2

Answer:

85

Step-by-step explanation:

x/5 = 67

x=335

(x+y)/6 = 70

(335+y)/6 = 70

335+y=420

y=85