Ametalworker has a metal alloy that is 25% copper and another alloy that is 65% copper. how many kilograms of each alloy should the metalworker combine to create 120 kg of a 49% copper alloy? the metalworker should use nothing kilograms of the metal alloy that is 25% copper and nothing kilograms of the metal alloy that is 65% copper.

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?