Reading book

Susan read a 250-page book. On the first day, she read 20% of the book. On the second day, half of the remaining pages. How many pages of the book has it unread?

Final Answer:

c =  100

Step-by-step explanation:

$$\begin{gathered} n=250 \\ r=20\%=\frac{20}{100}=\frac{1}{5}=0.2 \\ a=r\cdot n=0.2\cdot 250=50 \\ b=1/2\cdot (n-a)=1/2\cdot (250-50)=100 \\ c=n-(a+b)=250-(50+100)=100 \end{gathered}$$

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