Question

Gigel cheltuie o suma de bani astfel:prima data 2 supra noua din suma initiala plus 7 lei,a doua oara 3 supra 7 din rest plus 4 lei,ramanandu-i 3,92
lei.care a fost suma initiala?

Answer 1

x=suma initial

2x/9+7= cheltuiala 1

x-2x/9-7=7x/9-7=rest

(7x/9 -7)* 3/7 +4=x/3-3+4x/3+1 =cheltuiala 2

2x/9+7+x/3+1+3,92=x

2x/9+x/3+11,92=x

2x+3x+134,28=9x

4x=107,28

x=26,82 lei