Reverse Thinking( Week 2 Practice) 1. When 19 is added to a certain number, the answer is 79. What is the number? 2. 51 plus a certain number is 91. What is the number? 3. Emily is 17 years old, which is equal to half of Nick's age of next year. What is the age of Nick now? 4. There were 50 books in a bookshelf originally. After half of the storybooks were borrowed by students, 28 books were left in the shelf. How many storybooks were there originally? 5. A Number X is added to 9 and the result is then reduced by 14. The final result is 5. What is the number X? |