Answer:
4 lawns
Step-by-step explanation:
if you keep adding 3/4 you will get to 2 1/4 hours after 4 lawns.
3/4+3/4=1 2/4
1 2/4+3/4=2 1/4
It doesn't add up exactly but as for the whole lawn its 4.
If it has to be exact it would be 4 and 1/4 of a lawn.