Mary spent $10.30 on dinner to stay in budget.
Step-by-step explanation:
Amount spent on breakfast = $6.25
Amount spent on lunch = $8.95
Amount spent on dinner = x
Average = $8.50
Average = [tex]\frac{Sum\ of\ values}{No.\ of\ values}[/tex]
[tex]8.50 = \frac{6.25+8.95+x}{3}\\8.50=\frac{15.20+x}{3}[/tex]
Multiplying both sides by 3
[tex]8.50*3=\frac{15.20+x}{3}*3\\25.50=15.20+x\\25.50-15.20=x\\x=10.30[/tex]
Mary spent $10.30 on dinner to stay in budget.
Keywords: Average, addition
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