200*1/4=50
300*(1-1/3)=200
1/2-1/3*9/14=1/2-3/14=7/14-3/14=2/7
(2/3+1/5)*15/16=2/3*15/16+1/5*15/16=5/8+3/16=13/16
1/2-1/3*9/14=1/2-3/14=7/14-3/14=4/14=2/7
200*1/4=50
300*(1-1/3)=200
1/2-1/3*9/14=1/2-3/14=7/14-3/14=2/7
(2/3+1/5)*15/16=2/3*15/16+1/5*15/16=5/8+3/16=13/16
1/2-1/3*9/14=1/2-3/14=7/14-3/14=4/14=2/7