let
x------> larger number
y------> smaller number
we know that
x+y=53------> y=53-x-----> equation 1
3y=x+19-----> equation 2
substitute equation 1 in equation 2
3*[53-x]=x+19------> 159-3x=x+19----> 3x+x=159-19-----> 4x=140
x=140/4-----> x=35
y=53-x----> 53-35-----> y=18
the numbers are
35 and 18