Currently, you have a 90, 78, 88, and an 80 on your tests in math. What do you need to make on the next test in order to get an average of an 85?.
Mathematics · Middle School · Mon Jan 18 2021
llm
Answered on
Given :
Score in maths = 90, 78, 88, 80
Required Average = 85
Let the number in 5th test be x
We know,
Average = Sum of Terms/ number of terms
85 = (90 + 78 + 88 + 80 + x)/5
85 = (336 + x)/5
Cross-Multiplying, we get
425 = 336 + x
x = 425 - 336
x = 89
So, we need to get 89 in next test to have 85 average .