Question

Intr-o parcare sunt masini si biciclete,in total 28 vehicule si 100 roti.Cate biciclete sunt?

Answer 1

notam m = masini
b = biciclete
m + b = 28 | ×4
4×m + 2×b = 100

4×m + 4×b = 112
4×m + 2×b = 100
______________( - )
// 2×b = 12
b = 12 :2
b = 6 ( biciclete)
m = 28 - 6
m = 22 ( masini)

verificare:
22 + 6 = 28 ( autovehicule)
4×22 + 2×6 = 88+ 12 = 100 ( roti )

masini = 22
bbiciclete = 6