b=2+2/3+1/6 ---------------------------- 1+1/4+2/3

(2+2/3+1/6)/(1+1/4+2/3)
=(12/6+4/6+1/6)/(12/12+3/12+8/12)
=(17/6)/(23/12)
=17/6 * 12/23
=17/1 * 2/23
=34/23