Question

某商场现有每千克单价为15元的甲种糖果30kg,每千克单价为12元的乙种糖果50kg,

Answer 1

(1)

(15*30+12*50+10*20)/(30+50+20)=12.5(元/千克)

(2)

调到每千克单价为13元需要甲种糖果X千克:

(15*X+12*50+10*20)/(X+50+20)=13

15X+800=13X+910

15X-13X=910-800

X=55(千克)

再补充甲种糖果:

X-30=55-30=25(千克)