When Rahul was born, his father was 35 years older than his brother and his mother was 25 years older than his sister. If Rahul's brother is 5 years older than him and his mother is 3 years younger than his father, how old was Rahul's sister when he was born ?	Choose the most appropriate option:
A) 11 years
B) 10 years
C) 12 years
D) 9 years
E) 8 years
When Rahul was born, his brother's age = 5 years; his father's age = (5 + 35)= 
<gadget id="calculator">(5 + 35)</gadget>
<output>40</output>
40 years,   his mother's age= (40 - 3)= 
<gadget id="calculator">(40 - 3)</gadget>
<output>37</output>
37 years;   his sister's age= (37 - 25)= 
<gadget id="calculator">(37 - 25)</gadget>
<output>12</output>
12 years.   Answer: Option 12 years
<result>C</result>
When Rahul was born, his father was 35 years older than his brother and his mother was 25 years older than his sister. If Rahul's brother is 5 years older than him and his mother is 3 years younger than his father, how old was Rahul's sister when he was born ?