Question

6 kg rosii si 4 kg pere costa 38 lei ,iar 4kg rosii si 5 kg pere costa 37 lei.Cat costa 1kg rosii si 1 kg pere ,separat?

Answer 1

$6r+4p=38/*4 \\ \\ 4r+5p=37/*6 \\ \\ \\ 24r+16p=152 \\ \\ 24r+30p=222 \\ \\ \\ 30p-16p=14p \\ \\ 222-152=70 \\ \\ 70:14=5(1p) \\ \\ 5*4=20 \\ \\ 6r=38-20=18 \\ \\ r=18:6=3$