Two positive integers have a sum of 11 and a product of 24. What is the absolute difference between those two numbers?

Câu 1 :What single digit does D represent when 2D × D51 = 807D?
Câu 2 :Two positive integers have a sum of 11 and a product of 24. What is the absolute difference between those two numbers?
Câu 3 :Caynan wrote a sequence of consecutive integers beginning with −37. If the sum of the integers he wrote is 200, what is the greatest integer in the sequence Caynan wrote?
Câu 4 :Recently, the manufacturer changed how Leon’s favorite pens are sold. The price of a box of pens has been reduced by 10%, and there are now 25% fewer pens per box. What is the percent change in the cost per pen?