IMO: B 1. Insufficient: since the number can be 12 or 89 or 56; Since the units digit is larger than the Units digit. 2. Sufficient: 4p-1= q; given but we know that q= 10x+p hence equating two, we have; 4p-1=10x+p; p= {10x+1}/3; hence q= {40x+1}/3 and X can take values from 1 till 9 Hence substituti...