If the smaller number is x, the larger is 1625/x where x<= 1625
So the sum is x + 1625/x for 0< x <= sqrt(1625)
-98
the answer is 6
3 and 5
8,10,12
16, 17 and 18
The product of two rational numbers, X and Y, is smaller than either of them if both are between 0 and 1.
Find 3 consecutive numbers where the product of the smaller two numbers is 19 less than the square of the largest number.
You could try dividing by composite numbers but the number that you are testing is divisible by a composite number, then it will be divisible by a prime factor of that composite number and that prime factor will be smaller. It is always easier to work with smaller numbers.
-98
The two numbers are 6 and 13 so therefore the smaller number is 6
4,6,8,10
the answer is 6
One of the numbers must be less that 1
3 and 5
5,6,7
By finding out whether they have any factors in common. If the only factor they have in common is 1, the LCM will be their product. If they have more factors in common, their LCM will be less than their product.
11,12,13