Two-thirds 4450

Marek has balls of three colors. Two-thirds of the balls are green, 2/7 are blue, and one ball is yellow. How many balls does Marek have?

Correct answer:

n =  21

Step-by-step explanation:


2/3n+2/7n+1=n

2/3·n+2/7·n+1=n

n = 21


n = 21/1 = 21

n = 21

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