George has 16 coins in his pocket. He has both dimes and quarters. If he has $2.20 in his pocket, how many of each coin does he have? How would your equation change if you knew that George had three times as many times as he had quarters instead of knowing the total number of coins in his pocket? What is the new equation?
(The last half of it is what I’m struggling on. Any help would be appreciated, thanks)

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?