Subtracting fractions to get 17/20

[chriscarson]

Your final answer is not how you should ever write a mixed number. You can not simply concatenate the integer +1 and the fraction -3/20 directly to a proper mixed number. The integer part and the fractional part must have the same sign. Change that integer, 1, into a fraction and subtract the fraction numerators to get a valid answer.

Integer you mean the whole number ?

 

[FactChecker]

Integer you mean the whole number ?

Yes

 

[chriscarson]

Yes

So you make 20 × 1 - 3 = 17 then / 20 .
Good looks more clear now for me .
Thanks