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skhemani
total plot size (house + garage) = 1+1/4 = 5/4
Unsold house plot = 1/2
Unsold garage plot = 1/4of(1/4 of house plot) = 1/16
total unsold = 9/16
fraction of unsold plot = (9/16)*(4/5) = 9/20

Answer C

why did you flip the total house plot from 5/4 to 4/5?
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CAMANISHPARMAR
Chris’s plot of land for his garage is \(\frac{1}{4}\) the size of his plot of land for his house. If Chris plans to sell \(\frac{1}{2}\) of the plot of land for his house and \(\frac{3}{4}\) of his plot of land for his garage, what fraction of his land will remain unsold?


A) \(\frac{1}{4}\)

B) \(\frac{1}{3}\)

C) \(\frac{9}{20}\)

D) \(\frac{1}{2}\)

E) \(\frac{11}{20}\)

If we let the plot of land for the house = 80 acres and the plot of land for the garage = 20 acres, then the total land = 100 acres.

So Chris sells 1/2 x 80 = 40 acres of the plot of land for his house and 3/4 x 20 = 15 acres of the plot of land for his garage, for a total of 55 acres, or 55/100 = 11/20, of the plot of land.

Therefore, the fraction of his land that is unsold is 1 - 11/20 = 9/20.

Answer: C
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Ish1996
skhemani
total plot size (house + garage) = 1+1/4 = 5/4
Unsold house plot = 1/2
Unsold garage plot = 1/4of(1/4 of house plot) = 1/16
total unsold = 9/16
fraction of unsold plot = (9/16)*(4/5) = 9/20

Answer C

why did you flip the total house plot from 5/4 to 4/5?

We have to do one more step after calculating the land remaining to be sold, which is to divide by the original amount, in order to get a fraction asked in the question.

\(\frac{9}{16}/\frac{5}{4}\) which then becomes \(\frac{9}{16} * \frac{4}{5}\)
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Deconstructing the Question
The garage land is 1/4 the size of the house land.
Chris sells 1/2 of the house land and 3/4 of the garage land.
We are asked to find the fraction of total land that remains unsold.

Step-by-step
Let the house land be 1.
Then the garage land is:
\(1/4\)

Total land:
\(1 + 1/4 = 5/4\)

House land sold:
\(1/2 × 1 = 1/2\)

Garage land sold:
\(3/4 × 1/4 = 3/16\)

Total land sold:
\(1/2 + 3/16 = 11/16\)

Land remaining:
\(5/4 − 11/16 = 9/16\)

Fraction of total land remaining:
\((9/16) ÷ (5/4) = 9/20\)

Answer: 9/20 (C)
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