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Mathematics 7 Online
OpenStudy (i_ask_alot):

I forgot how to do ratios can some one tell me how to do them again

Mehek (mehek14):

you want me to give an example?

OpenStudy (i_ask_alot):

yes please!:P

OpenStudy (alivejeremy):

i wanna learn too :D

Mehek (mehek14):

so let's we have this problem: You have 4 red marbles and 7 blue marbles Find the ratio of red marbles to blue marbles You can write that in 3 ways: 1) 4 to 7 2) 4:7 3) \(\dfrac{4}{7}\)

OpenStudy (alivejeremy):

so let's we have this problem?

OpenStudy (alivejeremy):

What's the three ways mehek :D

OpenStudy (i_ask_alot):

The ratio of boys to girls in the Science Club is 3:5. If there are 60 girls, how many boys are there? A) 23 B) 36 C) 38 D) 45

OpenStudy (alivejeremy):

Oh Nvm i see

Mehek (mehek14):

set up proportions \(\dfrac{3}{5}=\dfrac{x}{60}\)

Mehek (mehek14):

now you can cross multiply 3*60 = ? 5 * x = ?

OpenStudy (i_ask_alot):

36????

Mehek (mehek14):

correct :)

OpenStudy (i_ask_alot):

THANKS!!!:):)

Mehek (mehek14):

yw :)

OpenStudy (alivejeremy):

Mehek how did yall get 36

OpenStudy (anonymous):

flutter

Mehek (mehek14):

cross multiplication

OpenStudy (alivejeremy):

Oh

OpenStudy (alivejeremy):

:D

Mehek (mehek14):

or ypu can look at it like this 5 times what gives 60? 12 so 3 * 12 = 36

Mehek (mehek14):

you*

OpenStudy (anonymous):

lol I just got warned by moderator XD

OpenStudy (alivejeremy):

Oh i get it mehek

OpenStudy (anonymous):

flutter wingspan flutter

OpenStudy (alivejeremy):

Mehek your my new teacher now airjordan is firer

Mehek (mehek14):

haha oke ;P

OpenStudy (i_ask_alot):

A piece of wire 6 cm long weighs 30 grams. What is the weight of an 8 m length of the same wire? A) 400 grams B) 425 grams C) 640 grams D) 4000 grams

Mehek (mehek14):

first we convert cm -> m

OpenStudy (anonymous):

flutter

OpenStudy (alivejeremy):

^^^^

OpenStudy (i_ask_alot):

how do u do that?

OpenStudy (alivejeremy):

lol

Mehek (mehek14):

1 cm = 0.01 m

Mehek (mehek14):

so 6 cm = 0.06 m

Mehek (mehek14):

\(\dfrac{0.06}{30}=\dfrac{8}{x}\)

OpenStudy (i_ask_alot):

4000

Mehek (mehek14):

so D

OpenStudy (i_ask_alot):

If a bag contains 18 red, 6 yellow, 24 blue, and 8 white balloons, what is the part to whole ratio of white balloons? A) 1:5 B) 1:6 C) 1:7 D) 1:8

Mehek (mehek14):

\(\dfrac{white}{total}\)

OpenStudy (i_ask_alot):

?????

Mehek (mehek14):

how many white? how many balloons in total?

OpenStudy (i_ask_alot):

8

Mehek (mehek14):

Total?

OpenStudy (i_ask_alot):

56

Mehek (mehek14):

8/56 simplify

Mehek (mehek14):

@I_Ask_Alot did you get it?

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