If the ratio of the ages of Mayank and Pritesh is 3 : n and the difference between the ages of Sachin and Mayank is 15 years. After 7 years the age of Sachin will be 58 years. If the difference between the age of Mayank and Pritesh is 12 years, the sequence of ages is Sachin > Mayank > Pritesh, then find the value of n2 + 3n + 5.
1
9
2
23
3
15
4
18
5
12