Question
A milkman mixes two types of milk, one costing ₹60 per
liter and the other costing ₹90 per liter, to make a mixture. The final mixture is sold at ₹84 per liter, earning a profit of 20%. In what ratio should the milkman mix the two types of milk?Solution
Selling price of mixture = ₹84/liter. Cost price of mixture = ₹84 ÷ 1.2 = ₹70/liter. Using alligation: Difference between ₹90 and ₹70 = ₹20. Difference between ₹70 and ₹60 = ₹10. Ratio = 20:10 = 2:1. Correct Option: b) 2:1
Find the average of prime numbers between 20 and 40.
If the average of s number is r⁴ and the average r number is s⁴, then find the average of all r+ s numbers
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