Question
A bag contains brown and grey balls in the ratio of 3 : 7. There is a total of 90 balls in the bag. How many more brown balls must be added into the bag so that the number of brown balls will be the same as the number of grey balls?
2 m

Click button first when a symbol is required. X

A bag contains brown and grey balls in the ratio of 3 : 7. There is a total of 90 balls in the bag. How many more brown balls must be added into the bag so that the number of brown balls will be the same as the number of grey balls?