If in two hours three lawns are being completed. How many lawns will be completed in ten hours?

12 lawns

15 lawns

13 lawns

None of these

To find the number of lawns completed in 10 hours, we can set up a proportion:

2 hours / 3 lawns = 10 hours / x lawns

We can then cross-multiply and solve for x:

2x = 3 × 10

2x = 30

x = 30/2

x = 15

So, in 10 hours, 15 lawns will be completed.