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vesna_86 [32]
3 years ago
12

Rosario is working on an 8-foot-by- 8-foot floor covered with 64 white tiles. She replaces x white tiles with blue tiles. After

she's finished, there are 40 white tiles left. Write and solve an equation to find the number of blue floor tiles Rosario used.​
Mathematics
1 answer:
timofeeve [1]3 years ago
5 0

Answer: 24 blue tiles.

Step-by-step explanation:

Initially, the floor is (completely) covered with 64 white tiles.

Now we remove x white tiles, and we replace them with blue tiles.

Then if we removed x white tiles, now the number of white tiles is:

64 - x

And we know that after Rosario finishes the work, there are 40 white tiles left in the floor.

Then:

64 - x = 40

now we can solve this for x.

64 - 40 = x

24 = x

this means that 24 blue tiles were used.

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Solution:

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\begin{gathered} m\angle3=65^0 \\ m\angle11=100^0 \end{gathered}\begin{gathered} m\angle2+m\angle3=180^0.............the\text{ sum of angles on a straight line} \\ m\angle2+65^0=180^0 \\ m\angle2=180-65 \\ m\angle2=115^0 \end{gathered}

Therefore, the measure of angle 2 is 115 degrees.

\begin{gathered} m\angle5=m\angle11.........................(alternate\text{ exterior angles are congruent\rparen} \\ m\angle5=100^0 \end{gathered}

Therefore, the measure of angle 5 is 100 degrees.

\begin{gathered} m\angle13=m\angle3.........................(alternate\text{ interior angles are congruent\rparen} \\ m\angle13=65^0 \end{gathered}

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