Question

And a bag of marbles 12 percent will read 40 percent with Blue and the rest were white is the back of 250 marbles how many were red or blue

Answer 1

In the bag of 250 marbles, the fraction of the blue is 4/ 25, in a percent, that'll be 16%. So, 16% of the bag is filled with blue marbles. 

I hope I helped :)