Sum & Difference of two numbers are 27 and 3 respectively. Can anyone find out the product of numbers?

Question

In a sequence of eleven real numbers, only two are shown. The product of every 3 successive boxes is 120. Find the sum of all the numbers in the boxes (including the two already open).

_  _  (6)  _  _  _  _  _  _  (-4) _ 

Answer 1

Let's two numbers are x & y
x+y=27...................(i)
x-y=3
=>x=3+y.................(ii)
(3+y)+y=27............Put value of x from (ii) into (i)
y=12
x=3+12=15
Then,
x*y=15*12=180
Ans :180

Answer 2

X + Y = 27
X - Y = 3
Then, 2X = 30 , X = 15 , Y = 12

X * Y  =  15 * 12 = 180