Answer: 3
You can use long division or a calculator to find that 24251/4 = 6062.75, so the 0.75 means we have 3/4 since 3/4 = 0.75; therefore the remainder is 3.
A shortcut is to divide just the last two digits by 4 and we get the same remainder: 51/4 = 12.75 = 12+(3/4) = 12 remainder 3