An urn contains marbles of four colors: red, yellow, blue, and green. All but 45 of the marbles are red; all but 45 are yellow;
all but 45 are blue; and all but 60 are green. How many of the marbles are green?
1 answer:
Answer:
5
Step-by-step explanation:
Let the number of
red marbles be r
blue marbles be b
yellow marbles be y and
green marbles be g
Let the Total number of marbles be T then
r + y + b + g = T
If all but 45 of the marbles are red then
y + b + g = 45
As such, r + 45 = T
all but 45 are yellow;
r + b + g = 45
As such, y + 45 = T
all but 45 are blue;
y + r + g = 45
As such, b + 45 = T
It means that the number of red, yellow and blue marbles are equal
Hence y = b = r
If all but 60 are green
y + b + r = 60
y + y + y = 60
3y = 60
y = 60/3 =20
This means that there are 20 yellow marbles, 20 red marbles and 20 green marbles
The total number of marbles T = 20 + 45 = 65
As such, g + 60 = T
g + 60 = 65
g = 65 - 60
= 5 marbles
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