Question

daca in fiecare banca a unei clase se aseaza cite 2 elevi ramin 3 in picioare daca se aseaza cite 3 in banca ramin 4 banci libere citi elvi shi cite banci sunt cu operati va rog

Answer 1

Răspuns:    33 elevi si 15 banci

Explicație pas cu pas:

Notez cu ,, b" = numar banci

2 × b + 3 → cate 2 elevi in banca, raman 3 elevi in picioare

3 × ( b - 4 ) → cate 3 elevi in banca, raman 4 banci libere

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3 × ( b - 4 ) = 2 × b + 3 => elevi

3 × b - 12 = 2 × b + 3

3 × b - 2 × b = 3 + 12

b = 15 ( banci )

2 × 15 + 3 = 33 elevi

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Verific:   3 × ( 15 - 4 ) = 3 × 11 = 33 elevi