math
posted by BOOKER .
A SERVING TRAY MADE OF BRASS WEIGHS 21 OUNCES. THIS BRASS IS AN ALLOY OF 70 PERCENT COPPER AND 30 PERCENT TIN. WHAT IS THE WEIGHT IN COPPER?
CHECK MY SOLUTION PLEASE!
70% OF 21 OZ= 30Z

No.
Multiply: 0.7 * 21 = ? 
You have it set up correctly, but think on your calculations: How can seventy percent of 21 ounces be MORE than 21 ounces?