Question

$8\frac{7}{3} - \frac{3}{5}$

Answer 1

(8x3+7)/3 - 3/5 = 
(24+7)/3 - 3/5 = 
31/3 - 3/5
mmc (3 e 5) = 15
(15:3.31)/15 - (15:5.3)/15 = 
(5x31)/15 - (3.3)/15 = 
151/15 - 9/15 = 
142/15