Question

Alexandra a citit 20% dintr-o carte.Aflati cate pagini are cartea,daca Alexandra mai are de citit inca 40 de pagini

Answer 1

x- 20x/100= 40 =>amplificăm cu 100
100x- 20x= 4000
80x= 4000
x= 4000/80
x= 50 de pagini are cartea.

Answer 2

20%+40=100% 40=100%-20% 40=80%  40pagini...80% Xpagini.....100% X=(40×100):80 X=4000:80 X=50 Total:50 pagini