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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. $$\dfrac{3}{4}=\dfrac{x}{8}$$
 $x=4$ $x=6$ $x=8$ $x=12$
•  Question 2: 1 pts You can buy four T-shirts for $\$24.$Write a proportion that gives the cost$c$of buying seven T-shirts. $4:7=c:247:4=24:c4:7=24:c4:c=24:7$•  Question 3: 1 pts The ratio of red marbles to green marbles is$7:5.$There are$21$red marbles. The given proportion can be used to find the number$x$of green marbles are there?$$\dfrac{7}{5}=\dfrac{x}{21}$$ •  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? $\dfrac{8}{30}=\dfrac{x}{28}\dfrac{8}{28}=\dfrac{30}{x}\dfrac{30}{8}=\dfrac{28}{x}\dfrac{8}{x}=\dfrac{28}{30}$•  Question 5: 2 pts If a$5$foot person casts a$3.2$foot shadow, which of the proportions can be used to find how tall is a person who casts a$4.8$foot shadow? $5:4.8=3.2:x5:x=4.8:3.2x:5=3.2:4.85:x=3.2:4.8$•  Question 6: 2 pts The property tax rate in a certain state is$\$1.25$ for every $\$250$in property value. If a home has a property value of$\$85 000$, which of the proportions can be used to find how much will be the property tax?
 $\$1.25:\$250=\$x:\$85000$ $\$1.25:\$250=\$85000:\$x$ $\$250:\$1.25=\$x:\$85000$ $\$250:\$85000=\$x:\$1.25$
•  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 $1.5\mbox{kg}$ of sugar for $2\mbox{kg}$ of strawberries. I have $5.5\mbox{kg}$ of strawberries. Which of the proportions can be used to find how much sugar do I need?
 $1.5:x=5.5:2$ $2:1.5=x:5.5$ $1.5:2=x:5.5$ $1.5:2=5.5:x$
•  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 $74\%.$
 $50:100\%=x:74\%$ $x:100\%=50:74\%$ $100\%:50=x:74\%$ $50:100\%=74\%:x$
•  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 $\dfrac{7}{19}$ to make the resulting fraction of $\dfrac{3}{4}.$
 $\dfrac{7}{19}=\dfrac{3}{4}+x$ $\dfrac{7}{19}+x=\dfrac{3}{4}$ $\dfrac{7+x}{19+x}=\dfrac{3}{4}$ none of the above
•  Question 11: 3 pts A map uses a scale $\dfrac{1}{4} \mbox{inches}=30 \mbox{miles}$. On a map, two cities are $2\dfrac{7}{8} \mbox{inches}$ 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 $15$ are cookbooks. If $30\%$ are cookbooks, which of the proportions can be used to find how many books are on the shelf?
 $\dfrac{10}{3}=\dfrac{15}{?}$ $\dfrac{3}{10}=\dfrac{15}{?}$ $\dfrac{15}{10}=\dfrac{3}{?}$ $\dfrac{3}{10}=\dfrac{?}{15}$