Let a be the remainder or the quotient of the division N : 7

\(\left(a\in N;a< 7\right)\).Then : N = 7a + a = 8a

N gets the biggest value only when a gets the biggest value or a = 6

Then, N = 48. So, the answer is C

We have:

a : 7 = c [residual d] with c = d and are the minimun. Find a

But c always diffirent from 0 => c = d > 0

=> Min of c and d = 1

=> a : 7 = c [residual d] <=> a : 7 = 1 [residual 1]

=> a = 1.7 + 1 = 8

So choose B