Primary 6 Question-how to solve this
Re-posting the below question as I could not find the answer on your website
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?
Can't wait to see your answer.