You should first calculate the weight of each marble
20 - 16 = 4 ounces difference between the 2 jars
140 - 100 = 40 marble difference between 2 jars
4 ounces divided by 40
4 ÷ 40 = 0.1 ounces per marble
So each marble is .1 ounces
0.1 ounces times 100 marbles (in second jar)
0.1 × 100 = 10 ounces of marbles
Jar + 10 ounces = 16 ounces
Jar = 16 - 10
Jar = 6 Ounces
