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Plugging In: Invisible Plugging In - Fractions

Rita, John, and Adam share the cost of their new car. Rita pays half as much as John, who pays one-third as much as Adam does. What fraction of the total cost of the car does John pay?
Correct. [[snippet]] The car costs >$$\text{Total} = \text{Rita}+\text{John}+\text{Adam}=\$1+$2+$6 = $9$$. John pays $2 out of that, so the final answer is $$\frac{2}{9}$$.
Incorrect. [[snippet]] This answer choice is Rita's share of the cost.
Incorrect. [[snippet]]
Incorrect. [[snippet]] All three are not paying equally, so this option is wrong.
Incorrect. [[snippet]]
$$\frac{1}{9}$$
$$\frac{2}{9}$$
$$\frac{2}{5}$$
$$\frac{1}{3}$$
$$\frac{3}{5}$$