Question

a199b
(12) 14 - 3 =
(13) 14 - 7 =
(14) 15 - 6 =
(15) 15 - 9 =
(16) 16 - 3 =
(17) 16 - 7 =
(18) 17 - 5 =
(19) 17 - 9 =
(20) 18 - 4 =
(21) 18 - 7 =
(22) 18 - 9 =

Explanation:

(12)

Step1: Subtract 3 from 14

$14 - 3 = 11$

Step1: Subtract 7 from 14

$14 - 7 = 7$

Step1: Subtract 6 from 15

$15 - 6 = 9$

Answer:

11

(13)