Aliens have been found in Mars who have six fingers in each of their hands, total

12 fingers in their two hands. We use 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 to do all the

calculation, and they use 0, 1, 2, 3, 4, a, 5, 6, 7, 8, 9, b. So, 10, 11, 12 in earth is 9,

b, 10 in Mars. Find the product of 1b and 16 in aliens’ system.'

Can some one help me to solve this problem