An Equation
http://wiki.answers.com/Q/A_number_sentence_which_...

An equation is a number sentence
http://www.chacha.com/question/whatisamathemati...

Then there are two modes, 8 and 10.
http://answers.yahoo.com/question/index?qid=200908...

The average is calculated by average = (sum of values)/(number of values). So, multiplying both sides by the number of values, sum of values = average*(number of values). That way
http://answers.yahoo.com/question/index?qid=200703...
