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lead density is 0.41 pounds/cubic inch 1.68 x 0.41 = 0.688 pounds
Multiply 68 by 1.60 to get 108.8.
Since one kg equates to approximately 2.2 pounds, use this conversion: 68 kg x 2.2 = about 150 pounds.
Everyone weighs differently depending on our height and if we're active or not. Although they should weigh about 80 pounds to 105 pounds. I'm very unactive and I eat a lot of unhealthy foods and I'm 68 pounds. I'm 12, but when I was 11 I weighed 64 pounds. A lot of the kids in my class (even the ones that aren't "fat" or obese) are 100 + and were last year.
You don't really need an equation. You just divide the total amount (68 pounds) by how many groups it's separated into (4 stacks). 68/4=17 pounds per stack.