John's average score on three tests is 87%. What is the least he can score on his fourth test so that his average grade will be at least 90%?

1 Answer
MeneerNask
May 22, 2016

To get an average of #>=90# on four tests he will have to score #>=360# in total.

Explanation:

Since the average on three tests was #87#, he must have scored #3xx87=261#, so his last score will have to be at least:

#360-261=99%#

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