1) 1 7/24 =31/24
2 7/30 =67/30
(31/24 + 67/30) *30/47 -5/8 =(930 +1608)/720 *30/47 -5/8 =(2538*30)/720*47 -5/8 =54*30/720 -5/8 =54/24 -5/8 =(54 -5*3)/24 = (54 -15)/24 =39/24 =1.625
2) 3 1/15 =46/15
1 14/15 =29/15
(46/15 + 29/15a) =1/6
(46a +29)/15a -1/6 =0
2*(46a +29) -5a) /30a =0
92a +58 -5a =0
87a = -58
a = -58/87
3) 5/12 m =5m/12
m -5m/12 =1/4
(12m -5m)/12 =1/4
7m/12 -1/4 =0
(7m -3)/12 =0
7m -3 =0
7m =3
m =3/7