Answer:
We know that for every 5 calendars Josh sold, Lauren sold 4. This is a ratio of 5:4, which means that for every 5 calendars Josh sells, Lauren sells 4.
We also know that Josh sold 45 calendars last month. We can use this information to find out how many calendars Lauren sold by using the ratio of 5:4.
We can set up the equation:
5/4 = 45/x
Where x represents the number of calendars that Lauren sold.
We can solve for x by multiplying both sides of the equation by x:
5x = 4*45
x= 4*45/5
x= 36
So Lauren sold 36 calendars last month.