Question

6 pixuri costa cat 4 stilouri,cat rest primesti la 500 de lei pt.2pixuri si 2 stilouri,stiind ca un stilou costa cu 9 lei mai mult decat un pix

Answer 1

6p=4s deci 3p=2s
1s=9+p deci 3p=2(9+p)
3p=18+2p
3p-2p=18
p=18
s=18+9
s=27
2s+2p= 2(s+p)=2*(27+18)=2*45=90
500-90=410