Question

Determinati valorile lui n ∈ |Ν pentru care avem :
[tex] a) \frac{3}{5} \ \textless \ \frac{n}{12} \ \textless \ \frac{14}{15}
b) \frac{2}{7} \ \textless \ \frac{n}{56} \ \textless \ \frac{3}{8}

[/tex]
Va rog !

Answer 1

a) 36/60 < 5n/60 < 56/60
36 < 5n < 56
36/5 < n < 56/5    7 < n ≤ 11  n∈{8,9,10,11}
b) 16/56 < n/56 < 21/56
16 < n < 21    n ∈ {17,18,19,20}