Five students wrote a mathematics test. The average mark was 68. If the marks for four of the students were 75, 62, 84 and 53, t
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7.5 = x + 
equals x = 6.
First, subtract from both sides. / Your problem should look like: 7.5 - = x.
Second, simplify 7.5 - to 6. / Your problem should look like: 6 = x.
Third, switch sides. / Your problem should look like x = 6, which is your answer.
First, subtract
Second, simplify 7.5 -
Third, switch sides. / Your problem should look like x = 6, which is your answer.