Answer:
(A) BASEK Landscaping mowed 63 lawns.
(B) Diamonds Cuts Landscaping mowed 45 lawns.
Explanation:
The ratio of the number of lawns BASEK Landscaping can mow to the number of lawns Diamonds Cuts Landscaping can mow is 7 : 5.
Let "x" be the scale factor. Therefore, the ratio is 7x : 5x.
If the total number of lawns both companies mowed is 108, then:

Solve for x to find the scale factor:




To calculate the number of lawns that BASEK mowed, substitute the found value of x into 7x:

To calculate the number of lawns that Diamond Cuts mowed, substitute the found value of x into 5x:

In conclusion:
- BASEK Landscaping mowed 63 lawns.
- Diamonds Cuts Landscaping mowed 45 lawns.