Proportions
tell whether the ratios form a proportion
1/2 5/10
they are equal.
there are 45 males and 60 females in a subway car.
find the ratio of males to females
3 to 4
5/8=20/d
d=32
120 units made in 5 days; 88 units made in 4 days
not proportional
find the unit rate
180 miles in 3 hours
60 miles per hour
3 T-shirts/7 T-shirts=$24/c
c=56
you earn $56 walking your neighbor's dog for 8 hours. your friend earns $36 painting your neighbor's fence for 4 hours.
what is you and your friends pay rate? are they equal?
friend: $9
yours: $7
they are not equivalent.
your friends heart beats 18 times in 15 seconds when at rest. while running your friend's heart beats 25 times in 10 seconds.
find the heart rate in beats per min at rest and while running
rest : 72 beats
running : 150 beats
in a orchestra, the ratio of trombones to violas is 1 to 3.
how many trombones are in the orchestra
3 to 9
you are 13 years old and your cousin is 19 years old. as you grow older is your are proportional to your cousins.
it is not proportional
your friends start hiking towards each other from opposite end of a 17.5 mile hiking trail. you hike 2/3 mile every 1/4 hour your friend hike 2 1/3 miles per hour
who hikes faster? How much faster?
you hike 1/3 mile per hour faster than your friend.
So you hike faster.
your friend says "48x= 6 x 12" is your friend right?
a specific shade of red nail polish requires 7 parts red to 2 parts yellow. A mixture contains 35 quarts of red and 8 quarts of yellow. How can you fix the mixture to make the correct shade of red?
add 2 quarts of yellow
you mix 2/5 cup of red paint for every 1/4 cup of blur paint to make 1 5/8 gallons of purple paint
how much red paint and blue paint do you use
16 cups of red paint and 10 cups of blue paint.
the school team has 80 swimmers. the ratio of seventh-grade swimmers to all swimmers is 5:16. Write a proportion that give the number s of seventh-grade swimmers. What is the proportion
proportion: s 7th-grade swimmers/80 swimmers=5 7th grade swimmers /16 swimmers