Read the essay. What is the writer's opinion and in which paragraph(s) is it stated? If you are a typical teenager today, you use your MP3 player on the way to school,

Дано:
W(сахара)=5%
m(раствора)=0,8кг=800г
Найти: m(Н2О)?, m(сахара)?
Решение.
W (сах)=m(сах)*100/m(р-ра)
 m(сах) =W*m(р-ра)/100
   m(сах) =5*800/100=40г
m(H2O)=800-40=760г
ответ: 40г, 760г