never mind i figured it out lol
31/3-2 2/5
= 10/3- 12/5 [ Changing mixed fraction to improper fraction ]
= (10 x 5)/(3 x 5)- (12 x 3)/(5 x 3) [ Making the denominator equal by multiplying the numerator and the denominator by a suitable number ]
= (50-36)/15= 14/15