设小玲带X元,小倩带Y元.
依题意:X/Y=6/5 (1)
实际小玲花的钱:X-20-10
实际小倩花的钱:Y+20
即:(X-20-10)/(Y+20)=3:4 (2)
联立(1)(2)则可求得
X=120,Y=100