Question

Daca de asaza cate 3 elevi intr-o banca raman 6 elevi in picioare . Daca se asaza cate 4 elevi intr-o banca , raman 2 banci goale .
Cate banci si cati elevi sunt ?

Answer 1

Răspuns:   14 banci si 48 elevi

Explicație pas cu pas:

b = numar banci

3 × b + 6 = 4 × ( b - 2 ) ⇒ elevi

4 × b - 8 = 3 × b + 6

4 × b - 3 × b = 6 + 8

b = 14 ( banci )

3 × 14 + 6 = 48 elevi

sau:

4 × ( 14 - 2 ) = 4 × 12 = 48 elevi

Answer 2

III...IIIIII

IIII.../__/__/

3×b+6=4×(b-2)

4×b-8=3×b+6

4×b+3=14(banci)

3×14+6=48 elevi