48/14 = 24/7
24/7 times 14 equals 48
1. Divide the amount needed by the weight:
0.5 milligram / 50 pounds = 0.01 milligram per pound.
2. m = 0.01w
3. m = 0.01(10)
4 m = 0.01 x 10
0.1 milligrams
The error was step 1.
To do this problem you use is/of=percent/100
So:
320/750=x/100
cross multiply
32,000=750x
divide both sides by 750
x=42.66 repeating
ANSWER: X=42.66 REPEATING