Question

julio wants to find the number of blades of grass in his backyard. he marks out a square with one - foot - long sides. he counts 3000 blades of grass in the square. his backyard, shown below, is rectangular and completely covered with grass. approximately how many blades of grass are in his backyard? a 9,000,000 b 4,500,000 c 900,000 d 90,000

Explanation:

Step1: Calculate backyard area

The area of a rectangle is $A = l\times w$, where $l = 60$ ft and $w = 50$ ft. So $A=60\times50 = 3000$ square - feet.

Step2: Calculate number of blades

There are 3000 blades per square - foot. So the total number of blades is $3000\times3000=9000000$.

Answer:

A. 9,000,000