At present, the ratio of Ram's to Shyam's age 4 : 5. 10 years before, the ratio was 19 : 25. If Mohan is 12 years older than Ram, then at present what is the average of the age of Ram, Shyam and Mohan together?
1
44 years
2
48 years
3
54 years
4
56 years
5
None of these