Chapter 12. Solution for less than 1.5 expected rolls.
1st roll: if 1-4 continue to choices.
1st roll: if 5 or 6, roll again and multiply with second number.
Module the multiplied number into 4 ( [5,10,15] = 1, [20,25,30] =2, [6,12,18] = 3, [24,30,36] =4)
This way you are able to proceed on first try, as well as capping it to 2 rolls.
Expected Rolls = 1*(4/6) + 2*(2/6) = 1.333333
Less than 1.5