Răspuns :
Fie x numarul de banci:
1 * x + 6 = 2 *(x-5) + 1
x+ 6 = 2x-10+1
x=15 banci
15 * 1 + 6 = 21 de elevi.
1 * x + 6 = 2 *(x-5) + 1
x+ 6 = 2x-10+1
x=15 banci
15 * 1 + 6 = 21 de elevi.
a + 6 = 2 * ( a - 5 ) + 1
a + 6 = 2a - 10 + 1
a + 6 = 2a - 9
a = 2a - 15
a = 15 banci
15 + 6 = 21 elevi
a + 6 = 2a - 10 + 1
a + 6 = 2a - 9
a = 2a - 15
a = 15 banci
15 + 6 = 21 elevi