15 and 30
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The numbers are -16 and -15.
19 and 34. Let the two numbers be x and y; then: x - y = 15 x + y = 53 Adding the two equations gives: 2x = 68 → x = 34 Substituting for x in the second gives: 34 + y = 53 → y = 19 Checking by substituting for x and y in the first gives: 34 - 19 = 15 as required.
The GCF of 15 and 27 is 3. The GCF of 15, 20 and 25 is 5. The GCF of 15, 27, 15, 20 and 25 is 1.
GCF of 72 and 15 is 3.
15 + 1 = 16, and 15 - 1 = 14, so the two numbers are 15 and 1.