Babu bought two varieties of pulse, costing Tk. 50 and Tk. 60 per Kg. each, and mixed them in some ratio. He then sold the mixture at Tk. 70 per kg., making a profit of 20 percent. What was the ratio of the mixture?

A 1 : 10

B 1 : 5

C 2 : 7

D None

Solution

Correct Answer: Option B

মনে করি,
৫০ টাকা কেজি দরে কিনাছিল x কেজি
এবং, ৬০ টাকা কেজি দরে কিনাছিল y কেজি 
প্রশ্নমতে, 120/100(50x+60y)= 70(x+y)
⇒6/5(50x+60y) = 70x+70y
⇒300x+360y = 350x+350y
⇒-50x = -10y
⇒x/y =1/5
∴x:y = 1: 5

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