Answer:
The number of $5 coins is 180
Explanation:
Let
x ---> the number of $10 coins
y ---> the number of $5 coins
z ---> the number of $2 coins
we know that
-----> equation A
---->
----> equation B
---->
----> equation C
Solve the system by substitution
Substitute equation B and equation C in equation A

solve for x





Find the value of y
therefore
The number of $5 coins is 180