She swims 12 laps on Monday.
Step-by-step explanation:
Total laps = 51 laps
Laps on Saturday = 15 laps
Let,
x be the number of laps on Monday, Wednesday and Friday each.
According to given statement;
Monday+Wednesday+Friday+Saturday = 51
[tex]x+x+x+15=51\\3x=51-15\\3x=36[/tex]
Dividing both sides by 3
[tex]\frac{3x}{3}=\frac{36}{3}\\x=12[/tex]
She swims 12 laps on Monday.
Keywords: addition, division
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