Question

ajutati ma va implor exercitiul 3 e foarte urgent dau coroana

Answer 1

s= suma initiala

cat a cheltuit in prima zi=s/3+20, cat a ramas dupa prima zi=s-s/3-20=2s/3-20

cat a cheltuit a doua zi=(2s/3-20)x(40/100)=(2s/3-20)x(2/5)=4s/15-40/5=4s/15-8

s=s/3+20+4s/15-8+60, numitor comun=15

15s=5s+300+4s-120+900, 15s-9s=1200-120, 6s=1080, s=1080/6=180 lei