This is a riddle that plays on the way numbers are written. If you take the letter "1" out of the word "four," you are left with "for," which sounds like the number "four." Therefore, you have taken 1 from 4 and left 5, in terms of the wordplay involved.
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Do it in Roman Numerals, and with an unconventional interpretation of "take from". The I in the Roman Numeral IV already means take this away from what follows, so taking away the I is really adding it back.
In literal terms, 1/2 (or .5). In this case, you can literally take one half and leave nothing.
To find what 1 4/5 is in decimal form, leave the 1 the way it is and change 1/4 to a decimal. To do that, divide 4 by 5, which is 0.8. 1 1/4 is 1.8 in decimal form.
Let the 5 digits nos be abcdef Without Repetition , a can take values from (1-5) -5 b can take only 4 values since no repetition c can take only 3 values d can take only 2 values e can take only 1 values Total = 5*4*3*2*1=120 With Repetittion a can take values from (1-5) -5 b can take 5 values since no repetition c can take 5 values d can take 5 values e can take 5 values Total = 5*5*5*5*5=3125
5 multiplied by 1/4 is 1 1/4
It is 7/8 minus 1/4 = 5/8