In a family the age of the father, mother, son and grandson are A, B, C and D years respectively. Given that A – B = 3 years, B + C = 78 years, C + D = 33 years and the average age of the family is 34 years, then B – C is:
A. 19 years
B. 20 years
C. 21 years
D. 22 years
Answer:D
In a family the age of the father, mother, son and grandson are A, B, C and D years respectively. Given that A – B = 3 years, B + C = 78 years, C + D = 33 years and the average age of the family is 34 years, then B – C is:
A. 19 years B. 20 years C. 21 years D. 22 years