SOLUTION: A jar contains 10 red marbles and 30 green ones. How many more red marbles must be added to the jar so that 60% of the marbles will be red?

Question 319040: A jar contains 10 red marbles and 30 green ones. How many more red marbles must be added to the jar so that 60% of the marbles will be red?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
The ratio of red to the total is where R is the number of red marbles.

You need to have 45 marbles in the jar to have 60% red.
You currently have 10 marbles.

You need to add red marbles.
RELATED QUESTIONS
jar contains 110 marbles of which 50 are red and 60 are green. The probability of... (answered by rapaljer)

A bag contains five red marbles, three green marbles, and four blue marbles. How many... (answered by Theo)

A jar has twice as many red marbles as white marbles and the ratio of blue marbles to... (answered by Boreal)

A jar contains 9 blue marbles, 6 green marbles, and 12 red marbles. How many blue marbles (answered by checkley77,dabanfield)

there are 300 marbles in a jar that contains only blue and red marbles. the number of... (answered by rm29924)

A jar has twice as many red marbles as white marbles and the ratio of blue marbles to... (answered by scott8148,stanbon)

A bag contains {6} red marbles, {5} yellow marbles, and {7} green marbles. How many... (answered by checkley77)

if a jar contains 23 red marbles and 4 green marbles, the probability that a marble... (answered by jim_thompson5910)

A jar contains 24 red and blue marbles. If the probability of selecting a red marble at... (answered by DrBeeee)