If 18 , x , y , -3 are in A. P then find x + y.

15

Step-by-step explanation:

If this is an arithmetic progression, then there is a common difference.

-3-18 = -21

-21/3 = -7

18 - 7 = x

x = 11

11 - 7 = y

y = 4

4 - 7 = -3

x + y

11 + 4 = 15

3: 2

step-by-step explanation:

shorter piece is 2: 3, so just reverse it, and you get 3: 2

-2

7 - 9 = -2

reversed:

-2 + 9 = 7