SOLUTION: Florence scored 74 and 81 on two history tests. Waht must she score on her test to have a B avergae

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Question 72433: Florence scored 74 and 81 on two history tests. Waht must she score on her test to have a B avergae
Answer by funmath(2933) About Me  (Show Source):
You can put this solution on YOUR website!
Florence scored 74 and 81 on two history tests. What must she score on her third test to have a B average?
It depends on what a B average is in her class.
If a B average is 80-89 then, letting x be the score on a third test:
80%3C=%2874%2B81%2Bx%29%2F3%3C=89
80%3C=%28155%2Bx%29%2F3%3C=89
3%2880%29%3C=3%28155%2Bx%29%2F3%3C=3%2889%29
240%3C=155%2Bx%3C=267
240-155%3C=155-155%2Bx%3C=267-155
85%3C=x%3C=112
Since it's not likely that she will have more than 12 extra credit points on the third test, she won't be able to get an A. Therefore, as long as she gets an 85 or mor on the test, she will have a B average.
Happy Calculating!!!!