Question

60% of the marbles in a container are red and rest are black . After another 9 black marbles are added, the ratio of red and black marbles becomes 4 : 3 . How many black marbles are There now?

Answer 1

Answer:

81

Step-by-step explanation:

red :black = 3:2

red= 3x

black=2x

now

black=2x+9

3x:(2x+9)= 4:3

9x= 8x+36

X=36

2x+9=81

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