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Karen biked at 13 mph for a time but got a flat tire

Karen biked at 13 mph for a time but got a flat tire. She then walked at 5 mph. She traveled a total of 93 miles. Had she biked the whole time, she would have gone 117 miles. How many hours did she walk?

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...

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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Can the Common Core Standards Alter the Rate of Child Development?

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The Tutor for Good phone app is now available for both iPhone and Android. Get quick step-by-step answers to math questions on the go, view past questions/answers, and connect with the Tutor for Good team, all in one convenient app! Click here to get it now, or copy...