20+1/2 x 16+3/7

= (20x2+1)/2 x (16x7+3)/7

= 41/2 x 115/7

= (41x115)/(2x7)

= 4715/14

How many 14's fit as a whole into 4715? 336.

336+x/14

How much of the numerator is left? 336x14=4704 then 4715 -4704 = 11

336 11/14

Watch YouTube - Adding & Subtracting Fractions and Mixed Numbers if you're still confused.