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Mathematics 7 Online
OpenStudy (im.new):

ill give medal and fan

OpenStudy (im.new):

so now ppl help ok heres the question

OpenStudy (im.new):

In a bag of blue and yellow marbles, the ratio of blue marbles to yellow marbles is 3:5. If the bag contains 60 yellow marbles, how many blue marbles are there? A) 12 B) 24 C) 36 D) 48

OpenStudy (im.new):

back

OpenStudy (phi):

you should write a proportion \[ \frac{3 \ blue}{5 \ yellow}= \frac{x}{60 \ yellow} \] and solve for x

OpenStudy (im.new):

12

OpenStudy (im.new):

right or wrong

OpenStudy (im.new):

i have one more question

OpenStudy (phi):

to solve \[ \frac{x}{60}= \frac{3}{5} \] multiple both sides by 60, like this \[ 60\cdot \frac{x}{60}= 60\cdot \frac{3}{5} \] now simplify both sides (on the left, 60/60 is 1)

OpenStudy (im.new):

60 x 60 is 3600 12 x 60 is 720

OpenStudy (phi):

the left side is 60/60 * x which is 1*x or just x now do the right side

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