Question

5 kg de struguri si 7 kg de pere costa 82,20 lei.Cat costa un kg de struguri si un kg de pere,daca pt 10 kg de struguri si 12 kg de pere se plateste 153,73 lei ?

Answer 1

153,73-82,20=71,53
71,53:5=14,306

Answer 2

5s+7p=82,20, s=(82,20-7p)/5
10s+12p=153,73, 10*(82,20-7p)/5+12p=153,73,164,4-14p+12p=153,73
2p=164,4-153,73= 10,67, p=5,335,
s=(82,2-7*5,335)/5=(82,2-37,345)/5=8,971