Directions –
(i) Closest base = 10, so deviations are +5 and +2.
(ii) Multiplication of deviations = 5 × 2 = 10
(iii) On left hand side, write 15 + 2 = 17 or 12 + 5 = 17.
(iv) On left side there are 2 digits, so we have to shift one digit from right side (because base 10 has only one zero, therefore only one digit will remain on right side).
(v) Write 17 + 1 = 18.
(vi) Required solutions 180.