A takes 6 days less than B to do a work. If both A and B working together can do it in 4 days, how many days will B take to finish it?
Solve for x: 4x2 – 4ax + (a2 – b2) = 0
OR
Solve for x: 3x2 - x + 2 = 0
OR
A shopkeeper buys some books for Rs. 80. If he had bought 4 more books for the same amount, each book would have cost Rs. 1 less. Find the number of books he bought.
OR
The sum of two number is 9 and the sum of their reciprocals is . Find the numbers.