ted needs an average of at least 70 on his 3 history tests. he has already scored 85 and 60 on 2 of them. what is the minimum grade ted need on his 3rd test?
Thanks
.7 * 300 = 210
85 + 60 + x = 210
x = 210 - 145
x = 65
You're welcome.
To find the minimum grade Ted needs on his third test, we can use the concept of average.
To find the average, we need to add up all the scores and divide by the total number of tests. In this case, we need to find the average of three history tests.
Ted has already scored 85 and 60 on two of the tests, so we can add these two scores together: 85 + 60 = 145.
To find the minimum grade Ted needs on his third test, we'll set up an equation: (85 + 60 + x) / 3 ≥ 70, where x represents the score he needs on his third test.
Now, we can solve for x.
First, we multiply 3 to both sides: (85 + 60 + x) ≥ 210.
Then, we can combine like terms: 145 + x ≥ 210.
Next, we'll subtract 145 from both sides: x ≥ 210 - 145.
Simplifying further, we have x ≥ 65.
Therefore, the minimum grade Ted needs on his third test is 65 or higher.