Question

HELPP PLEASE DUE TOMMOROW PLEASE ANSWER QUESTION B

Answer 1

28 non-blue marbles.

Explanation:

Initial probability of choosing a blue marble = 4/12

Let the number of non-blue marbles to be added be x.

`(4)/(12+x) =(1)/(10)`

`12+x=40` (cross multiply)

`x=28`