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The diameter of a toilet roll…

The diameter of a toilet paper roll is 11cm, while the cardboard roll on the inside is 4cm. (Whole thing is 11cm, part without paper is 4cm in middle). Each piece of paper is 12cm by 12cm and the whole roll contains 240 sheets total. How many turns of the toilet paper...

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Roberto invested some money at 7%

Roberto invested some money at 7%, and then invested $2,000 more than twice his amount at 11%. His total annual income from the two investments was $3,990. How much was invested at 11%?

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