A milkman has 2 types of milk. He buys (b−3) liters of 1st type of milk costing Rs. 30/liter and 60 liters of 2nd type of milk costing Rs. 20/liter. If he mixed both types of milk and sold the total mixture at Rs. 30/liter, he get a profit of 25%. What is the value of 2�+5" id="MathJax-Element-126-Frame" role="presentation" style="position: relative;" tabindex="0">2�+5 $2�+5$ $2�+5$ b+5)?