stationery shop had three types of pens costing rupees 10,rs 25,and rs 50. there were twice as many 25-rupee pens as there were 10-rupee pens. the 50-rupee pens added up to a value of rs 350 .if the total value of pens was rs 1550,how many pens of each type were there?
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Step-by-step explanation:
Combined value of 10Rs and 25Rs pen = 1550-350=1200 Rs
Let number of pens of 10 Rs = x
then x ⋅10+2x⋅25=1200
(x)60=1200
∴ x=20(number of 10 Rs pen)
∴ number of 20 Rs pen = 2 ⋅ 20=40 pens
and number of 50 Rs pen = 350/50=7 pens
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