Question 821471
Let the two numbers be denoted as 'a' and 'b'
From the first sentence: a = 3b - 4 eqn1
From the second sentence: a = 64 - b eqn2

equating eqn 1&2: 3b - 4 = 64 - b
3b   b = 64   4
4b = 68
b = 17

Substitute b = 17 into eqn1:
a = 3b - 4
a = 3(17) - 4
a = 51 - 4
a = 47

:. The two numbers are 17&47