Thread: Divisibility problem

IF m is divisible by 5 what is the largest number that must be evenly divisible into 5m + 25 ? Ans=25

How did they get 25 here?

Originally Posted by MikeNoob

How did they get 25 here?

If m is divisible by 5 then we can write m=5k So 5m+25=25k+25=25(k+1)

honestly, it seems the correct answer is 5m + 25, which surely divides 5m + 25 (and may be bigger than 25, if m is larger than 5).

I take 'evenly divisible by 25' to mean not the number itself. I take the question to mean what is the largest number that will divide into 5m+25 for all m.

Originally Posted by biffboy

I take 'evenly divisible by 25' to mean not the number itself. I take the question to mean what is the largest number that will divide into 5m+25 for all m.

I still dont get how they got
25 ?