Final answer:
To find the number of gym memberships sold last year, set up an equation and solve for 'x'.
Step-by-step explanation:
To find the number of gym memberships sold last year, we need to set up an equation.
Let's denote the number of memberships sold last year as 'x'.
Since this year's sales were 30% less than last year's, we can set up the equation: x - 0.3x = 125,713.
Simplifying the equation gives us 0.7x = 125,713.
Dividing both sides of the equation by 0.7, we find that x = 179,590.
Therefore, they sold 179,590 gym memberships last yea