Ryan's average for 5 arithmetic test was 89. On four of the tests he made 96,86,92, and 80. What did he make on the fifth test?
89=(93 + 86+ 92+ 80+ x) / 5
Solve for 89 x 5 = 445
Add other grades 93+86+92+80=351
445-351=x
x = 94
94 is correct. Karen -- I like your method for solving this problem.
To find out what Ryan made on the fifth test, we can use the formula for calculating the average:
Average = (sum of all scores) / (number of scores)
We're given that Ryan's average for the 5 arithmetic tests is 89, and we know the scores for four of those tests. So let's calculate the sum of all the scores:
Sum of all scores = 96 + 86 + 92 + 80 + x
Here, 'x' represents the score on the fifth test. Since the average was 89, we can set up the equation:
89 = (96 + 86 + 92 + 80 + x) / 5
To solve for 'x', we'll multiply both sides of the equation by 5:
445 = 96 + 86 + 92 + 80 + x
Now, we can solve for 'x' by subtracting the sum of the known scores from both sides:
445 - (96 + 86 + 92 + 80) = x
445 - 354 = x
x = 91
Therefore, Ryan made a score of 91 on the fifth test.
(96 + 86 + 92 + 80 + x) / 5 = 89
Solve x?