If the ratio of the ages of Mona and Sona is 4:5 and twelve years hence their ages will be in the ratio of 5 : 6,
If the ratio of the ages of Mona and Sona is 4:5 and twelve years hence their ages will be in the ratio of 5 : 6, then the age of Sona after 6 years will be ……………
A) 66 years
B) 55 years
C) 67 years
D) 77 years
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