Question

Daca 3 l de lapte costa 17,40lei afla cat costa 5,5l lapte

Answer 1

3l.......17,40lei

5,5l.....x, regula de 3 simpla

x=5,5 * 17,40 :  3 = 5,5 * 5,8 = 31,90 lei

Answer 2

3 l lapte..........17,40 lei

5.5 l lapte......x lei

3 supra 5.5=17.40 supra x

x=5.5*17.40 supra 3

x=95.70 supra 3

x=31.90 lei