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A jar contains 10 red marbles and 30 green Ones. How many red marbles must be added to the jar so that 60 % of the marbles will be red



You need to have 45 marbles in the jar to have 60% red.
You currently have 10 marbles.
You need to add 35 red marbles.
0 0 0
how do you know we need 45 marbles?
Ratio of Red total = R/R+30

where R is No. of red marbles

R/R+30 = 60/100
100R = 60(R+30)
100R= 60R+ 1800
40R = 1800
R = 45
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