Consider two bodies. One of them is has mass thrice and accelerates twice the other. What can you say about the impulse generated by the second body if the impulse by first body can be represented by I ?

$\frac{1}{6}I$

Let the force due to the first body be F.

$F = (3m)(2a) = 6ma$

if F' is the force due to the second body then $F' = ma$

  $ \Rightarrow  F = 6 ma = 6 F'$ ... 

Impulse : $I = Ft $

  $I = 6 mat = 6 F' t = 6 I'$ ... [I' is the impulse due to the second body]

Thus, $I' = \frac{I}{6}$