Kaleb earned 85, 95, 93, and 80 points on the 4 tests, each worth 100 points, given so far this term. How many points must he earn on his fifth test, also worth 100 points, to average 90 points for the 5 tests given this term?

A.) 87

B.) 88

C.) 90

D.) 92

E.) 97

A.) 87

B.) 88

C.) 90

D.) 92

E.) 97

sum of terms

--------------------- = average

number of terms

85 + 95 + 93 + 80 + x

---------------------------- = 90 {substituted x for missing score}

5

353 + x

---------- = 90 {combined like terms in numerator}

5

353 + x = 450 {multiplied each side by 450}

x = 97

--------------------- = average

number of terms

85 + 95 + 93 + 80 + x

---------------------------- = 90 {substituted x for missing score}

5

353 + x

---------- = 90 {combined like terms in numerator}

5

353 + x = 450 {multiplied each side by 450}

x = 97

**97 points**must be earned on 5th test**E.)***- Algebra House*