Question

aflati pretul unui telefon si al unei tablete, stiind ca impreuna costa 3600 de lei, iar pretul telefonului reperezinta 80% din cel al tabletei.​

Answer 1

pret telefon-x

pret tableta-y

alcatuim sistem de 2 ecuatii:

x+y=3600

x=80y/100

y=3600-x

x=80y/100

y=3600-x

x=(80*(3600-x))/100

y=3600-x

x=(288000-80x)/100

y=3600-x

x=2880-0,8x

y=3600-x

x+0,8x=2880

y=3600-x

1,8x=2880

y=3600-x

x=2880/1,8

y=3600-x

x=1600(lei)

y=3600-1600

x=1600(lei)

y=2000(lei) costa tableta

x=1600(lei) costa telefonul