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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?
A. 10
B. 25
C. 35
D. 45
E. 75
A. 10
B. 25
C. 35
D. 45
E. 75
18 Nov 2024, 09:58
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Let, x= red marbles that need to be added
ATQ, (10+x)/30=(60/40)
or, (40)(10+x)=(60)(30)
or, 400+40x= 1800
or, 40x=1800-400
or, 40x=1400
or, x=1400/40
or, x =35
ATQ, (10+x)/30=(60/40)
or, (40)(10+x)=(60)(30)
or, 400+40x= 1800
or, 40x=1800-400
or, 40x=1400
or, x=1400/40
or, x =35
