1+1+90+(1+40) * 5/3 =1880, while 1 =470.
Then there are 470 cartoons, 470+90=560 science and technology books and (470+40)*5/3=850 literature and art books.
Checking calculation 470+560+850= 1880, correct.
2, add up the combination of two kinds of sugar, you will find that the total sugar plus the weight of the second toffee, then
2/3 * 60+3/4 * 60+0.6 * 60 = 40+45+36 =121kg
The weight of toffee is (12 1-60)/2=30.5 kg.
Fruit candy is 2/3*60-30.5=9.5 kg.
Soft candy is 3/4 * 60-30.5 =14.5kg.
Crispy sugar 0.6 * 60-30.5 = 5.5kg
The checking calculation is 30.5+9.5+ 14.5+5.5 = 60kg, which is correct.