Math New Drill (Level 2) : Number sense and theory SNJ00-0704-L2 Find denominators of two fractions

The least common multiple of the two integers X and Y (X< Y) is 96 and 1/X + 1/Y = 19/96. 

Find X and Y. 





Answer
X = 6, Y = 32

Solution
Divisors of 96 are 1, 96, 2, 48, 3, 32, 4, 24, 6, 16, 8, 12. 

When it is set to be as 1/X = A/96 and 1/Y = B/96, A + B = 19 (A < B). 

In the multiples of 96, it is found that 3 + 16 = 19. 

As 3/96 = 1/32 and 16/96 = 1/6, X = 6 and Y = 32.