Answer
Number of $\$10$ Notes =$518400$
Number of $\$20$ Notes =$3,577,600-518400=3059200$
Work Step by Step
Value of $\$ 10$ bills + Value of $\$ 20$ bills $=10x+20(3,577,600-x)$
$66,368,000=10x+20(3,577,600-x)$
This gives:
$66,368,000=10x+20 \times 3,577,600- 20 x$
or, $-10x= -5184000$
or, $x=518400$
Thus, the number of $\$10$ notes is =$518400$
The number of $\$20$ notes is=$3,577,600-518400=3059200$
