What two consecutive integers have the sum of 35?
1. None
2. 6,7
3. 15,17
4. 17, 18

The answer is actually 17 and 18 and that choice isn’t listed here. You could solve this a few different ways, and one of those is by the guess and check method. Start by taking two numbers, say 15 and 16, and add them together. You would find the answer to be 31. You then realize that you need 4 more to make 35.

You can choose higher numbers, such as 16 and 17, until you find the pair that works. Choice 3 does not work because it doesn’t equal 35 and because the integers are not consecutive. Choice 2 doesn’t work because it only equals 13.