Question

Ryan estimated that the crystal rock weighed 4.5 pounds. He placed it in a scale and it weighed exactly 4.65 pounds. What's the percent of error?

Answer 1

well, the pounds differnce is simply 4.65 - 4.5 = 0.15.

now, if we take 4.5 as the 100%, what's 0.15 off of it in percentage?

`\begin{array}{ccll} amount&\%\\ \cline{1-2} 4.5 & 100\\ 0.15& x \end{array} \implies \cfrac{4.5}{0.15}~~=~~\cfrac{100}{x} \\\\ 4.5x=15\implies x=\cfrac{15}{4.5}\implies x=\cfrac{10}{3}\implies x=3(1)/(3)`