In a family, the age of father, mother, son, and grandson are A, B, C, – McqOptions

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1.	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:
A.	19
B.	20
C.	21
D.	22
Answer» E.

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