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  • Pre algebra
  • Percents, Ratios and Propotions
  • Write proportions

Write proportions

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  • Question 1:
    1 pts
    		Solve the proportion. 34=x8\dfrac{3}{4}=\dfrac{x}{8}

    x=4x=4

    x=6x=6

    x=8x=8

    x=12x=12

  • Question 2:
    1 pts
    		You can buy four T-shirts for $24.\$24. Write a proportion that gives the cost cc of buying seven T-shirts.
    4:7=c:244:7=c:24
    7:4=24:c7:4=24:c
    4:7=24:c4:7=24:c
    4:c=24:74:c=24:7
  • Question 3:
    1 pts
    		The ratio of red marbles to green marbles is 7:5.7:5. There are 2121 red marbles. The given proportion can be used to find the number xx of green marbles are there?75=x21\dfrac{7}{5}=\dfrac{x}{21}
  • Question 4:
    1 pts
    		If eight trash bags last for thirty days, which of the proportions can be used to find how many days will last for twenty-eight trash bags?
    830=x28\dfrac{8}{30}=\dfrac{x}{28}
    828=30x\dfrac{8}{28}=\dfrac{30}{x}
    308=28x\dfrac{30}{8}=\dfrac{28}{x}
    8x=2830\dfrac{8}{x}=\dfrac{28}{30}
  • Question 5:
    2 pts
    		If a 55 foot person casts a 3.23.2 foot shadow, which of the proportions can be used to find how tall is a person who casts a 4.84.8 foot shadow?

    5:4.8=3.2:x5:4.8=3.2:x

    5:x=4.8:3.25:x=4.8:3.2

    x:5=3.2:4.8x:5=3.2:4.8

    5:x=3.2:4.85:x=3.2:4.8

  • Question 6:
    2 pts
    		The property tax rate in a certain state is $1.25\$1.25 for every $250\$250 in property value. If a home has a property value of $85000\$85 000, which of the proportions can be used to find how much will be the property tax?
    $1.25:$250=$x:$85000\$1.25:\$250=\$x:\$85000
    $1.25:$250=$85000:$x\$1.25:\$250=\$85000:\$x
    $250:$1.25=$x:$85000\$250:\$1.25=\$x:\$85000
    $250:$85000=$x:$1.25\$250:\$85000=\$x:\$1.25
  • Question 7:
    2 pts
    		Carol can type 520 words in 13 minutes. Which of the proportions can be used to find how many words can she type in 40 minutes?
  • Question 8:
    2 pts
    		The recipe for strawberry jam says 1.5\mboxkg1.5\mbox{kg} of sugar for 2\mboxkg2\mbox{kg} of strawberries. I have 5.5\mboxkg5.5\mbox{kg} of strawberries. Which of the proportions can be used to find how much sugar do I need?
    1.5:x=5.5:21.5:x=5.5:2
    2:1.5=x:5.52:1.5=x:5.5
    1.5:2=x:5.51.5:2=x:5.5
    1.5:2=5.5:x1.5:2=5.5:x
  • Question 9:
    3 pts
    		Which of the proportions can be used to find how many points a student needs to have on the test if test worth 50 points to gets the score of 74%.74\%.

    50:100%=x:74%50:100\%=x:74\%

    x:100%=50:74%x:100\%=50:74\%

    100%:50=x:74%100\%:50=x:74\%

    50:100%=74%:x50:100\%=74\%:x

  • Question 10:
    3 pts
    		Which of the proportions can be used to find what number must be added to both numerator and denominator of the fraction 719\dfrac{7}{19} to make the resulting fraction of 34.\dfrac{3}{4}.
    719=34+x\dfrac{7}{19}=\dfrac{3}{4}+x
    719+x=34\dfrac{7}{19}+x=\dfrac{3}{4}
    7+x19+x=34\dfrac{7+x}{19+x}=\dfrac{3}{4}
    none of the above
  • Question 11:
    3 pts
    		A map uses a scale 14\mboxinches=30\mboxmiles\dfrac{1}{4} \mbox{inches}=30 \mbox{miles}. On a map, two cities are 278\mboxinches2\dfrac{7}{8} \mbox{inches} inches apart. Which of the proportions can be used to find how many miles apart are the two cities?
  • Question 12:
    3 pts
    		There are some books on the shelf and 1515 are cookbooks. If 30%30\% are cookbooks, which of the proportions can be used to find how many books are on the shelf?
    103=15?\dfrac{10}{3}=\dfrac{15}{?}
    310=15?\dfrac{3}{10}=\dfrac{15}{?}
    1510=3?\dfrac{15}{10}=\dfrac{3}{?}
    310=?15\dfrac{3}{10}=\dfrac{?}{15}

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