Trees are being planted in an area of land that measures approximately three acres. one acre contains 43,560 square feet, if one tree requires a space of two yards by one yard of ground to grow properly, how many trees can be planted per acre?
a) 2,420
b) 4,840
c) 7,260
d) 21,780

1 yard = 3 feet, so    2yds x 1yd    is the same as    6ft x 3ft, or 18 square feet

If one acre contains 43,560 square feet, and the question asks how many trees can be planted per acre, then all we have to do is divide 43,560 by 18:

43,560 ÷ 18 = 2420 trees

So, the answer is A) 2,420.