Primary 6 math question

I am not sure which concept to apply here. Appreciate your pointers. Thanks.

Question:
I have some red and yellow marbles in a bottle.
If i add in 20 red marbles, 60% of my marbles are yellow.
If I add in another 60 yellow marbles, 75% of my marbles are yellow.
How many marbles do i have in the bottle?

Zach's Answer:

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Sep 06, 2016
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starstarstarstarstar 		Specific grade 6 resources for kids
by: A4K

Not sure either where the concept applies. But there is a great website I found that provides an interactive penalty shootout math games for kids in grade 6 and 7 and you should try it out. http://algebra4kids.com/algebra-games-collection.html
Aug 02, 2016
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by: Zach

Hi Cecilia,

Thank you for sending in the question. I have posted the solution above, Let me know if anything is not so clear. Send me more questions if need help with other questions.
Aug 01, 2016
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starstarstarstarstar 		Primary 6 Math question- Can't get my head around this...
by: Anonymous

Hi Zach,

Re-posting the below question:

I have some red and yellow marbles in a bottle.
If i add in 20 red marbles, 60% of my marbles are yellow.
If I add in another 60 yellow marbles, 75% of my marbles are yellow.
How many marbles do i have in the bottle?


Could you please post the correct video to the above question? Can't work out the answer.. would love to see how you solve this problem.

Thanks
Cecilia

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