ratio of blue to red marbles

Another way to think about this is:

11 blue marbles = 9 red marbles

So, 1 blue marble = 9/11 red marble

(99 blue) x (9/11 red per blue) = 81 red marbles

ratio of blue to red marbles

Tutors, please sign in to answer this question.

Another way to think about this is:

11 blue marbles = 9 red marbles

So, 1 blue marble = 9/11 red marble

(99 blue) x (9/11 red per blue) = 81 red marbles

`11 99 <-- Blue Marbles`

`-- = --`

`9 x <-- Red Marbles`

You can cross multiply to solve for x.

11*x = 99*9

11x = 891

11/11 x = 891/11

x = 81

So if there are 99 blue marbles, to maintain the ratio, there must also be 81 red marbles.

Scott M.

Physics and Math Expert

New York, NY

Yamil V.

Professor at Top University, Politics, Statistics and Programming

New York, NY

5.0
(49 ratings)

Sankalp S.

Mt Sinai Grad Tutor with 3.97 GPA adept for Maths and Science tutoring

New York, NY

5.0
(1 ratings)