It would take 2 hours. To complete the whole lawn you would need:

To make a whole, so to get that we multiply:

So we use the same number required for the whole lawn, and multiply it times the hours
1/12 hour = 5 minutes, 2 weeks is 14 days, so 5*15 = the amount of time he brushes his teeth so you would need to change from hours to minutes
3/4 coins are heads:
THHH
HTHH
HHTH
HHHT
4 chances
2 options of heads/tails with 4 coins
2*2*2*2= 16
4/16 :)
Answer: It's Congruent but not similar because the shape on top doesn't look like the bottom left.
Step-by-step explanation: