Question

din suma economista un elev a cheltuit in prima zi 3/5 din suma,in a doua zi3/5 din rest in a treia 1/3 din noul rest iar in a patra zi ultimii 150 lei.sa se afle suma initiala sivcat a cheltuit in primele trei zile.

Answer 1

x=suma initiala
3x/5=ziua 1
x-3x/5=2x/5=rest
2x/5 ×3/5=6x/25=ziua 2
2x/5-6x/25=4x/25=rest
4x/25 × 1/3= 4x/75=ziua 3
3x/5+6x/25+4x/75+150=x
45x+18x+4x+11250=75x
8x=11250
x=1406,25 lei
ziua 1  3x/5=3*1406,25/5=843.75 lei
ziua 2  6x/25=6*1406,25/25=337.50lei
ziua 2  4x/75=4*1406,25/75=75 lei