A jar contains 10 red marbles and 30 green marbles. how many red marbles must be added to the jar so 60% of the marbles will be red
Answers
Answered by
8
Let number of marbles to be added = x
Then,
(10 + x) = 60% of (30 + 10 + x)
10 + x = 60/100*40 + 60/100 * x
x - 6x/10 = 24 - 10
4x/10 = 14
x = 14*10/4
x = 35
So, 35 marbles should be added.
Then,
(10 + x) = 60% of (30 + 10 + x)
10 + x = 60/100*40 + 60/100 * x
x - 6x/10 = 24 - 10
4x/10 = 14
x = 14*10/4
x = 35
So, 35 marbles should be added.
Answered by
2
35 marbles must be added to the jar so 60% of the jar is red.
Similar questions
green balls = 30
let the total number of balls be x.
therefore according to problem ,
30 = ( 100 - 6 0 ) % x
= 40 % x.
therefore ,
45 = 60 % x .
therefore number of total number of red balls = 45.
and the number of red balls added = 45 - 10
= 35 .