Section: Math

69) If xy=156, x+y=43, and x<y, what is the value of x-y? 

1. -35
2. 35
3. 0
4. -24

Answer 1 is correct. Divide 156 by two and check to see if two numbers add up to 43. 156/2=78. 2+78=43? Try again. 156/3=3+52=55? Try again. 156/4=39. 4+39=43? Correct. Now plug in the lower number for x (4) and the higher number for y (39), and you're left with 4-39, or 4+(-39). This equals -35.