In a family, the age of father, mother, son and grandson are A, B, C and D respectively. Given that A - B = 3, B + C = 78, C + D = 33 and the average age of the family is 34 years, then B - C is :

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Q: 117 (CAPF/2014)
In a family, the age of father, mother, son and grandson are A, B, C and D respectively. Given that A - B = 3, B + C = 78, C + D = 33 and the average age of the family is 34 years, then B - C is :
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question_subject: 

Logic/Reasoning

question_exam: 

CAPF

stats: 

0,11,11,2,2,7,11

keywords: 

{'average age': [0, 0, 1, 2], 'age': [2, 1, 1, 2], 'grandson': [0, 0, 1, 1], 'family': [0, 1, 0, 0], 'father': [15, 3, 10, 14], 'years': [1, 0, 0, 2], 'mother': [4, 3, 4, 7]}