Find square footage of his yard assuming is is roughtly a rectangle area of rectangle=length times width length=20ft width=12 ft
area=length times width=20 times 12= 240 square feet
how many packages? 1 pack times x is at least 240 1 pack times x>240 50 times x>240 divide both sides by 50 x>4.8 you can't buy 0.8 pack, so round up 5 packs needed