Answer:
There would be 4 pennies
Explanation:
40-16=24
24/2=12
12/3=4
there are 40 coins in total, 16 are dimes. there are 24 left, half of that is 12, meaning there are 12 quarters. There is another 12 remaining and there are double the amount of pennies for the nickels. 4*2=8 and 8+4=12.
(hope this helps!:D)