Answer: the difference between the angles is 156
Step-by-step explanation: firstly, you need to assume that C is variable X
by that you can say that B is 14X , since B is 14 times C which we assumed is X
and since they are "supplementery" then the addition of those angles will be 180 degrees so by saying B+C=180° which is the same is (14X)+X=180° you can find X (C)
then multiply the result X(C) by 14 to get angle B
then subtract the angles B and C and you're done