ANSWER: 
A pair of numbers that have 1, 2, 7 and 14 as a common factors are 296 and 592. 
SOLUTION: 
We need to find a pair of numbers that both have 1, 2, 7 and 14 as a common factor. 
Let, both the numbers be x and y. 
According to the given information, 
“x” has factors 1, 2, 7 and 14. 
So, x = 1 × 2 × 7 × 14 × m 
Here, m is any integer. Because, x can also have factors other than 1, 2, 7 and 14. 
And, y also has factors 1, 2, 7 and 14. 
So, y = 1 × 2 × 7 × 14 × n 
Here, m is any integer. I used n, but not m as for x, because y can have other factors unlike m. 
Now, x = 296m and y = 296n. 
From above, we can say that multiples of 296 will have 1, 2, 7 and 14 as factors. 
Let us put m = 1 and n = 2 
x = 296 and y = 592 
Hence, a pair of numbers that have 1, 2, 7 and 14 as a common factors are 296 and 592.