Question 400004
Let {{{n}}} = number of nickels
Let {{{d}}} = number of dimes
given:
(1) {{{n + d <= 16}}}
(2) {{{n >= 4d}}}
you could combine these:
from (1):
{{{n <= 16 - d}}}
therefore
{{{4d <= n <= 16 - d}}} answer