Question

Mihaela are 7/10 din suma pe care o are Mihai.Ce suma are fiecare daca Mihaela are cu 30 de lei mai putin decat Mihai

Answer 1

7/10 * x=y;..... x-30=y;...... Rezulta:.... 7x/10=x-30↔ 7x=10(x-30)↔ 7x=10x-300↔ 7x-10x=-300↔ -3x=-300↔ x=100. Deci Mihai are 100 lei, atunci Mihaela are: 100-30=70 lei.