At present, a mother is 3 times older than her son. After 5 years, the sum of their ages will be 70 years. The age of the mother after 10 years will be
A. 40
B. 55
C. 45
D. 60
Answer:B
At present, a mother is 3 times older than her son. After 5 years, the sum of their ages will be 70 years. The age of the mother after 10 years will be
A. 40 B. 55 C. 45 D. 60