Need help with this math problem

Question

At a fundraising event for a local kindergarten a total of 400$ dollars is collected in three different denominations 5$ 10$ and 20$ bills. There are 4 more 10$ bills than 20$ bills and twice as many 5$ bills as 20$ bills find the amount of all three collected

Answer 1

t represents the number of $20

2t represents the number of $5

t + 4 represents the number of $10

 

5(2t) + 10(t + 4) + 20t = 400

 

Can you solve for t and answer?