Question 209214
Suppose he had all nickels. That would be
{{{150/5 = 30}}} nickels
Suppose I change {{{10}}} of those nickels
for dimes. I have
{{{10*5 = 50}}} or {{{5}}} dimes
and
{{{20*5 = 100}}} or {{{20}}} nickels
Now I'll change nickels into dimes:
-----------------------------------
18 nickels
6 dimes
----------
16 nickels
7 dimes
----------
14 nickels
8 dimes
----------
12 nickels
9 dimes
That looks like the answer- 3 more nickels than dimes
check:
{{{12*5 = 60}}}
{{{9*10 = 90}}}
{{{90 + 60 = 150}}}
OK