Question

Hari finds that 20 thumbtacks have a mass of about 3.6 grams. There are about 0.035 ounces in 1 gram. About how many ounces do 20 thumbtacks weigh? A 0.13 oz B 0.0063 Oz C 0.7 oz D 0.18 oz

Answer 1

A)0.13

Explanation

so

`\begin{gathered} \text{if} \\ 20\text{ thumbtacks}\rightarrow3.6\text{ grams} \\ \end{gathered}`

to find the weigth of the 20 thumbtacks we need to convert the 3.6 grams( the acutal weigth of 20 thumbtacks) into ounces by using a rule of three

`\begin{gathered} \text{if } \\ 1\text{ gram}\rightarrow0.035\text{ ounces} \\ 3.6\text{ gram}\rightarrow x\text{ ounces} \\ (1)/(0.035)=(3.6)/(x) \\ x=3.6\cdot0.035 \\ x=0.126 \\ \text{rounded} \\ x=0.13 \end{gathered}`

`A)0.13`

I hope this help you