Problems 1: If the cost price of an article is 80% of its selling price, then the profit percentage will be-
Aptitude of Exam Level Maths Problems
Solution: Let's selling price is 100 units. And the cost price will be 80 unit as per the question. And gain =100-80=20. So, apply to the executing of the percentage of profit formula. Because we know gain and cost price.
Math Problems 2:- A milkman bought 70 litres of milk for rupees 630 and added costless 5 litres of water. If he sells it 9 rupees per litres, then find his profit percentage.
Solution:- We will use the above formula again. To use that formula, we have to find total profit he made.
Profit= (Selling price - Cost price)
(70+5)*9 -630= 675-630 = 45 Rupees.
Now apply the above formula:
Problem 3: A train starts running from a place at 1 P.M at the rate of 18 km per hours. Another train starts from the same place at 3 P.M in the same direction and over-takes the first train at 9 P.M. The speed of the second train in km/hour is -
Problem 4: Water and sugar in two vessels A and B are in the ratio5:3 and 5:4 respectively. In what ratio, the liquids in both the vessels are mixed to obtain a new mixture in vessel C in the ratio 7:5?
Solution: We can solve this problem using arithmetic operation. But the easiest method is the allegation. We use it for the quicker solution.