Jada says “I know 4 nickels and 7 dollar coins weigh 76.7 grams. I know 4 nickels and 5 dollar coins weigh 60.5 grams. Here’s what else I can figure out based on that: 2 dollar coins weigh 16.2 grams. How did jada figure out that 2 dollar coins weigh 11 grams?
