Question

Which is NOT true?

15 = 15

15 = 18 - 3

15 + 3 = 11 + 7

15 + 3 = 15 + 13

Answer 1

the last one is not true

Explanation:

15+3=18, 15+13=28

Answer 2

the last one

Explanation:

since 28 is different from 18