Here it is again.
To figure out the solution, you have to think about how much each item represents.
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The lipsticks equal 30 divided by three, so each tube of lipstick is equal to 10.
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Lipstick (10) plus mirror plus mirror equals 20, so a mirror equals five.
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Mirror (5) plus two nail polishes plus two nail polishes equals nine, which means that a nail polish equals two.
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Therefore, one nail polish equals one.