Question

stu is laying brick down to make a patio. he plans for the patio to be 12.5 feet by 18.3 feet. he orders enough brick for 247 square feet. which statement about the amount of brick is correct?
stu estimated correctly by rounding up. he ordered enough brick. the exact area is 228.75 square feet.
stu estimated correctly by rounding down. he ordered enough brick. the exact area is 228.75 square feet.
stu did not estimate correctly by rounding up. he did not order enough brick. the exact area is 228.75 square feet.
stu did not estimate correctly by rounding down. he did not order enough brick. the exact area is 228.75 square feet.

Explanation:

Step1: Calculate the exact area

The area of a rectangle is $A = l\times w$, where $l = 18.3$ feet and $w=12.5$ feet. So $A=18.3\times12.5 = 228.75$ square feet.

Step2: Compare with the ordered - amount

Stu ordered enough brick for 247 square feet. Since $247>228.75$, he ordered enough brick. Also, 247 is greater than 228.75, which means he rounded up in his estimation.

Answer:

Stu estimated correctly by rounding up. He ordered enough brick. The exact area is 228.75 square feet.