I need to by 100 pens
from 100Rs given
Cost of Blue pen: 0.50
Cost of Red pen : 5.50
cost of Green pen: 9.50
Answers
Given : Cost of Blue pen: 0.50 , Cost of Red pen : 5.50 , cost of Green pen: 9.50
To find : buy 100 Pens from 100 Rs
Solution:
Cost of Blue pen: 0.50
Cost of Red pen : 5.50
cost of Green pen: 9.50
Let say Red Pen = R
& Green Pen = G
Blue Pen = 100 - G - R
5.5R + 9.5G + (100 - G - R)/2 = 100
=> 11R + 19G + 100 - G - R = 200
=> 10R + 18G = 100
=> 5R + 9G = 50
=> 9G = 50 - 5R
=> 9G = 5(10 - R)
G = 5 & R = 1
=> Blue Pen = 100 - 5 - 1 = 94
Green Pens = 5 5 * 9.5 = 47.5
Red Pens = 1 1 * 5.5 = 5.5
Blue Pen = 94 94 * 0.5 = 47
Total 100 100
5 Green Pens , 1 red Pen & 10 Blue Pens
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