Question 1070015
I find out also:
5n+10d+25q=450
n+d+q=28
For   d=62-4q    and    for n=3q-34
so we start solving for possible solutions,

q       d       n     total coins
10      22      4      36
11      18      1      30
12      14      2      28
13      10      5      28 
14      6       8      28 
15      4       11     30

Three solutions.

This gives me more questions than answers...
Can someone please help me to determine which way to go or if there is any specific format or formula for this type of word problem???