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Proporciones
Matemáticas
Middle School Math
Proporciones

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 Name _____________________________ Date ___________________
Proporciones
Completa.
 1 You have the set of numbers {-1, 0,9,6,-7,-9,-2,-2,4,1,3}. What is the ratio of negative numbers to positive numbers?
 2 At the local convenience store, bubble gum outsells non-bubble gum by a four-to-one ratio. If the store sold 235 pieces of gum today, how many of them were pieces of non-bubble gum?

Completa.
 3 If there is a two in six chance of getting a red flower when crossing a red flowered plant with a white flowered plant, how many white flowered plants would be expected in a population of736offspring from such a cross?
 4 If the ratio of saturated to unsaturated fatty acids in a cell membrane is9to1, and there are a total of84billion fatty acid molecules, how many of them are saturated?

 Key #2
Completa.
 5 In a specimen of granite from the nearby mountain the ratio of feldspar to quartz is4to2by mass. If the mountain consists of 7 x 108tons of granite, how much of it is feldspar. For this calculation you may assume that other minerals in the granite do not contribute significantly to its mass. Express your answer in scientific notation.
 6 The lava output from the volcano in crater park has quadrupled over the past30days. If the lava output30days ago was2tons of rock per week, what is the output now?

Completa.
 7 On planet X, the atmospheric pressure is lower than it is on planet Y. Interplanetary probes were recently sent to the two planets and data were obtained on many things including the atmospheric pressure. The pressure on planet Y is16N/m2. If the pressure on planet X isun terciothat of planet Y, what is the pressure, in Pascals, on planet X? Round your answer to the nearest hundredth if necessary.
 8 Space ship Z is traveling at183,000miles per second. Spaceship Q is traveling at171,000miles per second. What is the ratio of speeds (Z/Q) of the two spaceships? Express your answer in terms of the maximum speed of light, which is186,000miles per second.

Completa.
 9 Savannah worked overtime at the lab to perform a chemical analysis on some sludge of unknown composition. She found it to be29.4% water by mass. If she completely dried a132-g (original mass) of the sludge, how much water was removed in the drying process? Round your answer to the nearest hundredth.
 10 According to the instructions for a chemical procedure, William mixed salt, baking soda and water in a2:1:25ratio by mass. How many grams of water would be required to make a mixture that contained24grams of salt?

 Key #2
Completa.
 11 In the local coed softball league, the male to female ratio is6:3. If there are193players in the league, how many are female?
 12 Mackenzie practices figure skating an average of10hours per week. Nicole practices figure skating an average of1.5hours for every hour Mackenzie practices. How many hours a week does Nicole practice?

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suscriptores de edHelper - Cree un imprimible nuevo
Clave también incluye las preguntas
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